Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/thread.cpp @ 11825:463f51256c86
AMD64HotSpot: emit jump to IC miss handler directly instead of emitting it inside verfied_entry
for empty methods we emitted something like this if a inline cache is needed:
prefix:
00: < IC check >
...
0b: jne <ic_miss_call>
11: nop
...
verified_entry:
20: ret
ic_miss_call:
21: jmp <entry of runtime function>
when a method is deoptimized, HotSpot patches the verified_entry (0x20) with a
jump to a stub that handles call-sites that has been made non-entrant. since this jump
is 5 bytes long, it will overwrite ic_miss_call and blow up every caller that
calls this method via the unverified entry (prefix).
the fix is to emit the jump to the runtime function inside the unverfied entry:
prefix:
00: < IC check >
...
0b: je <verified_entry>
11: jeq <entry of runtime function>
16: nop
...
verified_entry:
20: ret
author | Bernhard Urban <bernhard.urban@jku.at> |
---|---|
date | Mon, 30 Sep 2013 09:32:18 +0200 |
parents | 6b0fd0964b87 |
children | d7964e96b0b0 |
rev | line source |
---|---|
0 | 1 /* |
7951 | 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/classLoader.hpp" | |
27 #include "classfile/javaClasses.hpp" | |
28 #include "classfile/systemDictionary.hpp" | |
29 #include "classfile/vmSymbols.hpp" | |
30 #include "code/scopeDesc.hpp" | |
31 #include "compiler/compileBroker.hpp" | |
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32 #ifdef GRAAL |
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33 #include "graal/graalCompiler.hpp" |
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34 #endif |
1972 | 35 #include "interpreter/interpreter.hpp" |
36 #include "interpreter/linkResolver.hpp" | |
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37 #include "interpreter/oopMapCache.hpp" |
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38 #include "jvmtifiles/jvmtiEnv.hpp" |
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39 #include "memory/gcLocker.inline.hpp" |
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40 #include "memory/metaspaceShared.hpp" |
1972 | 41 #include "memory/oopFactory.hpp" |
42 #include "memory/universe.inline.hpp" | |
43 #include "oops/instanceKlass.hpp" | |
44 #include "oops/objArrayOop.hpp" | |
45 #include "oops/oop.inline.hpp" | |
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46 #include "oops/symbol.hpp" |
1972 | 47 #include "prims/jvm_misc.hpp" |
48 #include "prims/jvmtiExport.hpp" | |
49 #include "prims/jvmtiThreadState.hpp" | |
50 #include "prims/privilegedStack.hpp" | |
51 #include "runtime/arguments.hpp" | |
52 #include "runtime/biasedLocking.hpp" | |
53 #include "runtime/deoptimization.hpp" | |
54 #include "runtime/fprofiler.hpp" | |
55 #include "runtime/frame.inline.hpp" | |
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56 #include "runtime/gpu.hpp" |
1972 | 57 #include "runtime/init.hpp" |
58 #include "runtime/interfaceSupport.hpp" | |
59 #include "runtime/java.hpp" | |
60 #include "runtime/javaCalls.hpp" | |
61 #include "runtime/jniPeriodicChecker.hpp" | |
62 #include "runtime/memprofiler.hpp" | |
63 #include "runtime/mutexLocker.hpp" | |
64 #include "runtime/objectMonitor.hpp" | |
65 #include "runtime/osThread.hpp" | |
66 #include "runtime/safepoint.hpp" | |
67 #include "runtime/sharedRuntime.hpp" | |
68 #include "runtime/statSampler.hpp" | |
69 #include "runtime/stubRoutines.hpp" | |
70 #include "runtime/task.hpp" | |
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71 #include "runtime/thread.inline.hpp" |
1972 | 72 #include "runtime/threadCritical.hpp" |
73 #include "runtime/threadLocalStorage.hpp" | |
74 #include "runtime/vframe.hpp" | |
75 #include "runtime/vframeArray.hpp" | |
76 #include "runtime/vframe_hp.hpp" | |
77 #include "runtime/vmThread.hpp" | |
78 #include "runtime/vm_operations.hpp" | |
79 #include "services/attachListener.hpp" | |
80 #include "services/management.hpp" | |
6197 | 81 #include "services/memTracker.hpp" |
1972 | 82 #include "services/threadService.hpp" |
10405 | 83 #include "trace/tracing.hpp" |
84 #include "trace/traceMacros.hpp" | |
1972 | 85 #include "utilities/defaultStream.hpp" |
86 #include "utilities/dtrace.hpp" | |
87 #include "utilities/events.hpp" | |
88 #include "utilities/preserveException.hpp" | |
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89 #include "utilities/macros.hpp" |
1972 | 90 #ifdef TARGET_OS_FAMILY_linux |
91 # include "os_linux.inline.hpp" | |
92 #endif | |
93 #ifdef TARGET_OS_FAMILY_solaris | |
94 # include "os_solaris.inline.hpp" | |
95 #endif | |
96 #ifdef TARGET_OS_FAMILY_windows | |
97 # include "os_windows.inline.hpp" | |
98 #endif | |
3960 | 99 #ifdef TARGET_OS_FAMILY_bsd |
100 # include "os_bsd.inline.hpp" | |
101 #endif | |
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102 #if INCLUDE_ALL_GCS |
1972 | 103 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepThread.hpp" |
104 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
105 #include "gc_implementation/parallelScavenge/pcTasks.hpp" | |
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106 #endif // INCLUDE_ALL_GCS |
1972 | 107 #ifdef COMPILER1 |
108 #include "c1/c1_Compiler.hpp" | |
109 #endif | |
110 #ifdef COMPILER2 | |
111 #include "opto/c2compiler.hpp" | |
112 #include "opto/idealGraphPrinter.hpp" | |
113 #endif | |
0 | 114 |
115 #ifdef DTRACE_ENABLED | |
116 | |
117 // Only bother with this argument setup if dtrace is available | |
118 | |
4006 | 119 #ifndef USDT2 |
0 | 120 HS_DTRACE_PROBE_DECL(hotspot, vm__init__begin); |
121 HS_DTRACE_PROBE_DECL(hotspot, vm__init__end); | |
122 HS_DTRACE_PROBE_DECL5(hotspot, thread__start, char*, intptr_t, | |
123 intptr_t, intptr_t, bool); | |
124 HS_DTRACE_PROBE_DECL5(hotspot, thread__stop, char*, intptr_t, | |
125 intptr_t, intptr_t, bool); | |
126 | |
127 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
128 { \ | |
129 ResourceMark rm(this); \ | |
130 int len = 0; \ | |
131 const char* name = (javathread)->get_thread_name(); \ | |
132 len = strlen(name); \ | |
133 HS_DTRACE_PROBE5(hotspot, thread__##probe, \ | |
134 name, len, \ | |
135 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
136 (javathread)->osthread()->thread_id(), \ | |
137 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
138 } | |
139 | |
4006 | 140 #else /* USDT2 */ |
141 | |
142 #define HOTSPOT_THREAD_PROBE_start HOTSPOT_THREAD_PROBE_START | |
143 #define HOTSPOT_THREAD_PROBE_stop HOTSPOT_THREAD_PROBE_STOP | |
144 | |
145 #define DTRACE_THREAD_PROBE(probe, javathread) \ | |
146 { \ | |
147 ResourceMark rm(this); \ | |
148 int len = 0; \ | |
149 const char* name = (javathread)->get_thread_name(); \ | |
150 len = strlen(name); \ | |
151 HOTSPOT_THREAD_PROBE_##probe( /* probe = start, stop */ \ | |
152 (char *) name, len, \ | |
153 java_lang_Thread::thread_id((javathread)->threadObj()), \ | |
154 (uintptr_t) (javathread)->osthread()->thread_id(), \ | |
155 java_lang_Thread::is_daemon((javathread)->threadObj())); \ | |
156 } | |
157 | |
158 #endif /* USDT2 */ | |
159 | |
0 | 160 #else // ndef DTRACE_ENABLED |
161 | |
162 #define DTRACE_THREAD_PROBE(probe, javathread) | |
163 | |
164 #endif // ndef DTRACE_ENABLED | |
165 | |
6197 | 166 |
0 | 167 // Class hierarchy |
168 // - Thread | |
169 // - VMThread | |
170 // - WatcherThread | |
171 // - ConcurrentMarkSweepThread | |
172 // - JavaThread | |
173 // - CompilerThread | |
174 | |
175 // ======= Thread ======== | |
176 // Support for forcing alignment of thread objects for biased locking | |
6197 | 177 void* Thread::allocate(size_t size, bool throw_excpt, MEMFLAGS flags) { |
0 | 178 if (UseBiasedLocking) { |
179 const int alignment = markOopDesc::biased_lock_alignment; | |
180 size_t aligned_size = size + (alignment - sizeof(intptr_t)); | |
6197 | 181 void* real_malloc_addr = throw_excpt? AllocateHeap(aligned_size, flags, CURRENT_PC) |
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182 : AllocateHeap(aligned_size, flags, CURRENT_PC, |
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183 AllocFailStrategy::RETURN_NULL); |
0 | 184 void* aligned_addr = (void*) align_size_up((intptr_t) real_malloc_addr, alignment); |
185 assert(((uintptr_t) aligned_addr + (uintptr_t) size) <= | |
186 ((uintptr_t) real_malloc_addr + (uintptr_t) aligned_size), | |
187 "JavaThread alignment code overflowed allocated storage"); | |
188 if (TraceBiasedLocking) { | |
189 if (aligned_addr != real_malloc_addr) | |
190 tty->print_cr("Aligned thread " INTPTR_FORMAT " to " INTPTR_FORMAT, | |
191 real_malloc_addr, aligned_addr); | |
192 } | |
193 ((Thread*) aligned_addr)->_real_malloc_address = real_malloc_addr; | |
194 return aligned_addr; | |
195 } else { | |
6197 | 196 return throw_excpt? AllocateHeap(size, flags, CURRENT_PC) |
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197 : AllocateHeap(size, flags, CURRENT_PC, AllocFailStrategy::RETURN_NULL); |
0 | 198 } |
199 } | |
200 | |
201 void Thread::operator delete(void* p) { | |
202 if (UseBiasedLocking) { | |
203 void* real_malloc_addr = ((Thread*) p)->_real_malloc_address; | |
6197 | 204 FreeHeap(real_malloc_addr, mtThread); |
0 | 205 } else { |
6197 | 206 FreeHeap(p, mtThread); |
0 | 207 } |
208 } | |
209 | |
210 | |
211 // Base class for all threads: VMThread, WatcherThread, ConcurrentMarkSweepThread, | |
212 // JavaThread | |
213 | |
214 | |
215 Thread::Thread() { | |
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216 // stack and get_thread |
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217 set_stack_base(NULL); |
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218 set_stack_size(0); |
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219 set_self_raw_id(0); |
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220 set_lgrp_id(-1); |
0 | 221 |
222 // allocated data structures | |
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223 set_osthread(NULL); |
6197 | 224 set_resource_area(new (mtThread)ResourceArea()); |
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225 DEBUG_ONLY(_current_resource_mark = NULL;) |
6197 | 226 set_handle_area(new (mtThread) HandleArea(NULL)); |
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227 set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true)); |
0 | 228 set_active_handles(NULL); |
229 set_free_handle_block(NULL); | |
230 set_last_handle_mark(NULL); | |
231 | |
232 // This initial value ==> never claimed. | |
233 _oops_do_parity = 0; | |
234 | |
235 // the handle mark links itself to last_handle_mark | |
10135 | 236 new HandleMark(this); |
237 | |
0 | 238 // plain initialization |
239 debug_only(_owned_locks = NULL;) | |
240 debug_only(_allow_allocation_count = 0;) | |
241 NOT_PRODUCT(_allow_safepoint_count = 0;) | |
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242 NOT_PRODUCT(_skip_gcalot = false;) |
0 | 243 CHECK_UNHANDLED_OOPS_ONLY(_gc_locked_out_count = 0;) |
244 _jvmti_env_iteration_count = 0; | |
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245 set_allocated_bytes(0); |
0 | 246 _vm_operation_started_count = 0; |
247 _vm_operation_completed_count = 0; | |
248 _current_pending_monitor = NULL; | |
249 _current_pending_monitor_is_from_java = true; | |
250 _current_waiting_monitor = NULL; | |
251 _num_nested_signal = 0; | |
252 omFreeList = NULL ; | |
253 omFreeCount = 0 ; | |
254 omFreeProvision = 32 ; | |
1587 | 255 omInUseList = NULL ; |
256 omInUseCount = 0 ; | |
0 | 257 |
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258 #ifdef ASSERT |
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259 _visited_for_critical_count = false; |
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260 #endif |
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261 |
0 | 262 _SR_lock = new Monitor(Mutex::suspend_resume, "SR_lock", true); |
263 _suspend_flags = 0; | |
264 | |
265 // thread-specific hashCode stream generator state - Marsaglia shift-xor form | |
266 _hashStateX = os::random() ; | |
267 _hashStateY = 842502087 ; | |
268 _hashStateZ = 0x8767 ; // (int)(3579807591LL & 0xffff) ; | |
269 _hashStateW = 273326509 ; | |
270 | |
271 _OnTrap = 0 ; | |
272 _schedctl = NULL ; | |
273 _Stalled = 0 ; | |
274 _TypeTag = 0x2BAD ; | |
275 | |
276 // Many of the following fields are effectively final - immutable | |
277 // Note that nascent threads can't use the Native Monitor-Mutex | |
278 // construct until the _MutexEvent is initialized ... | |
279 // CONSIDER: instead of using a fixed set of purpose-dedicated ParkEvents | |
280 // we might instead use a stack of ParkEvents that we could provision on-demand. | |
281 // The stack would act as a cache to avoid calls to ParkEvent::Allocate() | |
282 // and ::Release() | |
283 _ParkEvent = ParkEvent::Allocate (this) ; | |
284 _SleepEvent = ParkEvent::Allocate (this) ; | |
285 _MutexEvent = ParkEvent::Allocate (this) ; | |
286 _MuxEvent = ParkEvent::Allocate (this) ; | |
287 | |
288 #ifdef CHECK_UNHANDLED_OOPS | |
289 if (CheckUnhandledOops) { | |
290 _unhandled_oops = new UnhandledOops(this); | |
291 } | |
292 #endif // CHECK_UNHANDLED_OOPS | |
293 #ifdef ASSERT | |
294 if (UseBiasedLocking) { | |
295 assert((((uintptr_t) this) & (markOopDesc::biased_lock_alignment - 1)) == 0, "forced alignment of thread object failed"); | |
296 assert(this == _real_malloc_address || | |
297 this == (void*) align_size_up((intptr_t) _real_malloc_address, markOopDesc::biased_lock_alignment), | |
298 "bug in forced alignment of thread objects"); | |
299 } | |
300 #endif /* ASSERT */ | |
301 } | |
302 | |
303 void Thread::initialize_thread_local_storage() { | |
304 // Note: Make sure this method only calls | |
305 // non-blocking operations. Otherwise, it might not work | |
306 // with the thread-startup/safepoint interaction. | |
307 | |
308 // During Java thread startup, safepoint code should allow this | |
309 // method to complete because it may need to allocate memory to | |
310 // store information for the new thread. | |
311 | |
312 // initialize structure dependent on thread local storage | |
313 ThreadLocalStorage::set_thread(this); | |
314 } | |
315 | |
316 void Thread::record_stack_base_and_size() { | |
317 set_stack_base(os::current_stack_base()); | |
318 set_stack_size(os::current_stack_size()); | |
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319 // CR 7190089: on Solaris, primordial thread's stack is adjusted |
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320 // in initialize_thread(). Without the adjustment, stack size is |
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321 // incorrect if stack is set to unlimited (ulimit -s unlimited). |
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322 // So far, only Solaris has real implementation of initialize_thread(). |
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323 // |
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324 // set up any platform-specific state. |
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325 os::initialize_thread(this); |
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326 |
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327 #if INCLUDE_NMT |
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328 // record thread's native stack, stack grows downward |
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329 address stack_low_addr = stack_base() - stack_size(); |
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330 MemTracker::record_thread_stack(stack_low_addr, stack_size(), this, |
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331 CURRENT_PC); |
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332 #endif // INCLUDE_NMT |
0 | 333 } |
334 | |
335 | |
336 Thread::~Thread() { | |
337 // Reclaim the objectmonitors from the omFreeList of the moribund thread. | |
338 ObjectSynchronizer::omFlush (this) ; | |
339 | |
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340 // stack_base can be NULL if the thread is never started or exited before |
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341 // record_stack_base_and_size called. Although, we would like to ensure |
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342 // that all started threads do call record_stack_base_and_size(), there is |
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343 // not proper way to enforce that. |
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344 #if INCLUDE_NMT |
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345 if (_stack_base != NULL) { |
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346 address low_stack_addr = stack_base() - stack_size(); |
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347 MemTracker::release_thread_stack(low_stack_addr, stack_size(), this); |
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348 #ifdef ASSERT |
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349 set_stack_base(NULL); |
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350 #endif |
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351 } |
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352 #endif // INCLUDE_NMT |
6197 | 353 |
0 | 354 // deallocate data structures |
355 delete resource_area(); | |
356 // since the handle marks are using the handle area, we have to deallocated the root | |
357 // handle mark before deallocating the thread's handle area, | |
358 assert(last_handle_mark() != NULL, "check we have an element"); | |
10135 | 359 delete last_handle_mark(); |
360 assert(last_handle_mark() == NULL, "check we have reached the end"); | |
0 | 361 |
362 // It's possible we can encounter a null _ParkEvent, etc., in stillborn threads. | |
363 // We NULL out the fields for good hygiene. | |
364 ParkEvent::Release (_ParkEvent) ; _ParkEvent = NULL ; | |
365 ParkEvent::Release (_SleepEvent) ; _SleepEvent = NULL ; | |
366 ParkEvent::Release (_MutexEvent) ; _MutexEvent = NULL ; | |
367 ParkEvent::Release (_MuxEvent) ; _MuxEvent = NULL ; | |
368 | |
369 delete handle_area(); | |
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370 delete metadata_handles(); |
0 | 371 |
372 // osthread() can be NULL, if creation of thread failed. | |
373 if (osthread() != NULL) os::free_thread(osthread()); | |
374 | |
375 delete _SR_lock; | |
376 | |
377 // clear thread local storage if the Thread is deleting itself | |
378 if (this == Thread::current()) { | |
379 ThreadLocalStorage::set_thread(NULL); | |
380 } else { | |
381 // In the case where we're not the current thread, invalidate all the | |
382 // caches in case some code tries to get the current thread or the | |
383 // thread that was destroyed, and gets stale information. | |
384 ThreadLocalStorage::invalidate_all(); | |
385 } | |
386 CHECK_UNHANDLED_OOPS_ONLY(if (CheckUnhandledOops) delete unhandled_oops();) | |
387 } | |
388 | |
389 // NOTE: dummy function for assertion purpose. | |
390 void Thread::run() { | |
391 ShouldNotReachHere(); | |
392 } | |
393 | |
394 #ifdef ASSERT | |
395 // Private method to check for dangling thread pointer | |
396 void check_for_dangling_thread_pointer(Thread *thread) { | |
397 assert(!thread->is_Java_thread() || Thread::current() == thread || Threads_lock->owned_by_self(), | |
398 "possibility of dangling Thread pointer"); | |
399 } | |
400 #endif | |
401 | |
402 | |
403 #ifndef PRODUCT | |
404 // Tracing method for basic thread operations | |
405 void Thread::trace(const char* msg, const Thread* const thread) { | |
406 if (!TraceThreadEvents) return; | |
407 ResourceMark rm; | |
408 ThreadCritical tc; | |
409 const char *name = "non-Java thread"; | |
410 int prio = -1; | |
411 if (thread->is_Java_thread() | |
412 && !thread->is_Compiler_thread()) { | |
413 // The Threads_lock must be held to get information about | |
414 // this thread but may not be in some situations when | |
415 // tracing thread events. | |
416 bool release_Threads_lock = false; | |
417 if (!Threads_lock->owned_by_self()) { | |
418 Threads_lock->lock(); | |
419 release_Threads_lock = true; | |
420 } | |
421 JavaThread* jt = (JavaThread *)thread; | |
422 name = (char *)jt->get_thread_name(); | |
423 oop thread_oop = jt->threadObj(); | |
424 if (thread_oop != NULL) { | |
425 prio = java_lang_Thread::priority(thread_oop); | |
426 } | |
427 if (release_Threads_lock) { | |
428 Threads_lock->unlock(); | |
429 } | |
430 } | |
431 tty->print_cr("Thread::%s " INTPTR_FORMAT " [%lx] %s (prio: %d)", msg, thread, thread->osthread()->thread_id(), name, prio); | |
432 } | |
433 #endif | |
434 | |
435 | |
436 ThreadPriority Thread::get_priority(const Thread* const thread) { | |
437 trace("get priority", thread); | |
438 ThreadPriority priority; | |
439 // Can return an error! | |
440 (void)os::get_priority(thread, priority); | |
441 assert(MinPriority <= priority && priority <= MaxPriority, "non-Java priority found"); | |
442 return priority; | |
443 } | |
444 | |
445 void Thread::set_priority(Thread* thread, ThreadPriority priority) { | |
446 trace("set priority", thread); | |
447 debug_only(check_for_dangling_thread_pointer(thread);) | |
448 // Can return an error! | |
449 (void)os::set_priority(thread, priority); | |
450 } | |
451 | |
452 | |
453 void Thread::start(Thread* thread) { | |
454 trace("start", thread); | |
455 // Start is different from resume in that its safety is guaranteed by context or | |
456 // being called from a Java method synchronized on the Thread object. | |
457 if (!DisableStartThread) { | |
458 if (thread->is_Java_thread()) { | |
459 // Initialize the thread state to RUNNABLE before starting this thread. | |
460 // Can not set it after the thread started because we do not know the | |
461 // exact thread state at that time. It could be in MONITOR_WAIT or | |
462 // in SLEEPING or some other state. | |
463 java_lang_Thread::set_thread_status(((JavaThread*)thread)->threadObj(), | |
464 java_lang_Thread::RUNNABLE); | |
465 } | |
466 os::start_thread(thread); | |
467 } | |
468 } | |
469 | |
470 // Enqueue a VM_Operation to do the job for us - sometime later | |
471 void Thread::send_async_exception(oop java_thread, oop java_throwable) { | |
472 VM_ThreadStop* vm_stop = new VM_ThreadStop(java_thread, java_throwable); | |
473 VMThread::execute(vm_stop); | |
474 } | |
475 | |
476 | |
477 // | |
478 // Check if an external suspend request has completed (or has been | |
479 // cancelled). Returns true if the thread is externally suspended and | |
480 // false otherwise. | |
481 // | |
482 // The bits parameter returns information about the code path through | |
483 // the routine. Useful for debugging: | |
484 // | |
485 // set in is_ext_suspend_completed(): | |
486 // 0x00000001 - routine was entered | |
487 // 0x00000010 - routine return false at end | |
488 // 0x00000100 - thread exited (return false) | |
489 // 0x00000200 - suspend request cancelled (return false) | |
490 // 0x00000400 - thread suspended (return true) | |
491 // 0x00001000 - thread is in a suspend equivalent state (return true) | |
492 // 0x00002000 - thread is native and walkable (return true) | |
493 // 0x00004000 - thread is native_trans and walkable (needed retry) | |
494 // | |
495 // set in wait_for_ext_suspend_completion(): | |
496 // 0x00010000 - routine was entered | |
497 // 0x00020000 - suspend request cancelled before loop (return false) | |
498 // 0x00040000 - thread suspended before loop (return true) | |
499 // 0x00080000 - suspend request cancelled in loop (return false) | |
500 // 0x00100000 - thread suspended in loop (return true) | |
501 // 0x00200000 - suspend not completed during retry loop (return false) | |
502 // | |
503 | |
504 // Helper class for tracing suspend wait debug bits. | |
505 // | |
506 // 0x00000100 indicates that the target thread exited before it could | |
507 // self-suspend which is not a wait failure. 0x00000200, 0x00020000 and | |
508 // 0x00080000 each indicate a cancelled suspend request so they don't | |
509 // count as wait failures either. | |
510 #define DEBUG_FALSE_BITS (0x00000010 | 0x00200000) | |
511 | |
512 class TraceSuspendDebugBits : public StackObj { | |
513 private: | |
514 JavaThread * jt; | |
515 bool is_wait; | |
516 bool called_by_wait; // meaningful when !is_wait | |
517 uint32_t * bits; | |
518 | |
519 public: | |
520 TraceSuspendDebugBits(JavaThread *_jt, bool _is_wait, bool _called_by_wait, | |
521 uint32_t *_bits) { | |
522 jt = _jt; | |
523 is_wait = _is_wait; | |
524 called_by_wait = _called_by_wait; | |
525 bits = _bits; | |
526 } | |
527 | |
528 ~TraceSuspendDebugBits() { | |
529 if (!is_wait) { | |
530 #if 1 | |
531 // By default, don't trace bits for is_ext_suspend_completed() calls. | |
532 // That trace is very chatty. | |
533 return; | |
534 #else | |
535 if (!called_by_wait) { | |
536 // If tracing for is_ext_suspend_completed() is enabled, then only | |
537 // trace calls to it from wait_for_ext_suspend_completion() | |
538 return; | |
539 } | |
540 #endif | |
541 } | |
542 | |
543 if (AssertOnSuspendWaitFailure || TraceSuspendWaitFailures) { | |
544 if (bits != NULL && (*bits & DEBUG_FALSE_BITS) != 0) { | |
545 MutexLocker ml(Threads_lock); // needed for get_thread_name() | |
546 ResourceMark rm; | |
547 | |
548 tty->print_cr( | |
549 "Failed wait_for_ext_suspend_completion(thread=%s, debug_bits=%x)", | |
550 jt->get_thread_name(), *bits); | |
551 | |
552 guarantee(!AssertOnSuspendWaitFailure, "external suspend wait failed"); | |
553 } | |
554 } | |
555 } | |
556 }; | |
557 #undef DEBUG_FALSE_BITS | |
558 | |
559 | |
560 bool JavaThread::is_ext_suspend_completed(bool called_by_wait, int delay, uint32_t *bits) { | |
561 TraceSuspendDebugBits tsdb(this, false /* !is_wait */, called_by_wait, bits); | |
562 | |
563 bool did_trans_retry = false; // only do thread_in_native_trans retry once | |
564 bool do_trans_retry; // flag to force the retry | |
565 | |
566 *bits |= 0x00000001; | |
567 | |
568 do { | |
569 do_trans_retry = false; | |
570 | |
571 if (is_exiting()) { | |
572 // Thread is in the process of exiting. This is always checked | |
573 // first to reduce the risk of dereferencing a freed JavaThread. | |
574 *bits |= 0x00000100; | |
575 return false; | |
576 } | |
577 | |
578 if (!is_external_suspend()) { | |
579 // Suspend request is cancelled. This is always checked before | |
580 // is_ext_suspended() to reduce the risk of a rogue resume | |
581 // confusing the thread that made the suspend request. | |
582 *bits |= 0x00000200; | |
583 return false; | |
584 } | |
585 | |
586 if (is_ext_suspended()) { | |
587 // thread is suspended | |
588 *bits |= 0x00000400; | |
589 return true; | |
590 } | |
591 | |
592 // Now that we no longer do hard suspends of threads running | |
593 // native code, the target thread can be changing thread state | |
594 // while we are in this routine: | |
595 // | |
596 // _thread_in_native -> _thread_in_native_trans -> _thread_blocked | |
597 // | |
598 // We save a copy of the thread state as observed at this moment | |
599 // and make our decision about suspend completeness based on the | |
600 // copy. This closes the race where the thread state is seen as | |
601 // _thread_in_native_trans in the if-thread_blocked check, but is | |
602 // seen as _thread_blocked in if-thread_in_native_trans check. | |
603 JavaThreadState save_state = thread_state(); | |
604 | |
605 if (save_state == _thread_blocked && is_suspend_equivalent()) { | |
606 // If the thread's state is _thread_blocked and this blocking | |
607 // condition is known to be equivalent to a suspend, then we can | |
608 // consider the thread to be externally suspended. This means that | |
609 // the code that sets _thread_blocked has been modified to do | |
610 // self-suspension if the blocking condition releases. We also | |
611 // used to check for CONDVAR_WAIT here, but that is now covered by | |
612 // the _thread_blocked with self-suspension check. | |
613 // | |
614 // Return true since we wouldn't be here unless there was still an | |
615 // external suspend request. | |
616 *bits |= 0x00001000; | |
617 return true; | |
618 } else if (save_state == _thread_in_native && frame_anchor()->walkable()) { | |
619 // Threads running native code will self-suspend on native==>VM/Java | |
620 // transitions. If its stack is walkable (should always be the case | |
621 // unless this function is called before the actual java_suspend() | |
622 // call), then the wait is done. | |
623 *bits |= 0x00002000; | |
624 return true; | |
625 } else if (!called_by_wait && !did_trans_retry && | |
626 save_state == _thread_in_native_trans && | |
627 frame_anchor()->walkable()) { | |
628 // The thread is transitioning from thread_in_native to another | |
629 // thread state. check_safepoint_and_suspend_for_native_trans() | |
630 // will force the thread to self-suspend. If it hasn't gotten | |
631 // there yet we may have caught the thread in-between the native | |
632 // code check above and the self-suspend. Lucky us. If we were | |
633 // called by wait_for_ext_suspend_completion(), then it | |
634 // will be doing the retries so we don't have to. | |
635 // | |
636 // Since we use the saved thread state in the if-statement above, | |
637 // there is a chance that the thread has already transitioned to | |
638 // _thread_blocked by the time we get here. In that case, we will | |
639 // make a single unnecessary pass through the logic below. This | |
640 // doesn't hurt anything since we still do the trans retry. | |
641 | |
642 *bits |= 0x00004000; | |
643 | |
644 // Once the thread leaves thread_in_native_trans for another | |
645 // thread state, we break out of this retry loop. We shouldn't | |
646 // need this flag to prevent us from getting back here, but | |
647 // sometimes paranoia is good. | |
648 did_trans_retry = true; | |
649 | |
650 // We wait for the thread to transition to a more usable state. | |
651 for (int i = 1; i <= SuspendRetryCount; i++) { | |
652 // We used to do an "os::yield_all(i)" call here with the intention | |
653 // that yielding would increase on each retry. However, the parameter | |
654 // is ignored on Linux which means the yield didn't scale up. Waiting | |
655 // on the SR_lock below provides a much more predictable scale up for | |
656 // the delay. It also provides a simple/direct point to check for any | |
657 // safepoint requests from the VMThread | |
658 | |
659 // temporarily drops SR_lock while doing wait with safepoint check | |
660 // (if we're a JavaThread - the WatcherThread can also call this) | |
661 // and increase delay with each retry | |
662 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
663 | |
664 // check the actual thread state instead of what we saved above | |
665 if (thread_state() != _thread_in_native_trans) { | |
666 // the thread has transitioned to another thread state so | |
667 // try all the checks (except this one) one more time. | |
668 do_trans_retry = true; | |
669 break; | |
670 } | |
671 } // end retry loop | |
672 | |
673 | |
674 } | |
675 } while (do_trans_retry); | |
676 | |
677 *bits |= 0x00000010; | |
678 return false; | |
679 } | |
680 | |
681 // | |
682 // Wait for an external suspend request to complete (or be cancelled). | |
683 // Returns true if the thread is externally suspended and false otherwise. | |
684 // | |
685 bool JavaThread::wait_for_ext_suspend_completion(int retries, int delay, | |
686 uint32_t *bits) { | |
687 TraceSuspendDebugBits tsdb(this, true /* is_wait */, | |
688 false /* !called_by_wait */, bits); | |
689 | |
690 // local flag copies to minimize SR_lock hold time | |
691 bool is_suspended; | |
692 bool pending; | |
693 uint32_t reset_bits; | |
694 | |
695 // set a marker so is_ext_suspend_completed() knows we are the caller | |
696 *bits |= 0x00010000; | |
697 | |
698 // We use reset_bits to reinitialize the bits value at the top of | |
699 // each retry loop. This allows the caller to make use of any | |
700 // unused bits for their own marking purposes. | |
701 reset_bits = *bits; | |
702 | |
703 { | |
704 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
705 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
706 delay, bits); | |
707 pending = is_external_suspend(); | |
708 } | |
709 // must release SR_lock to allow suspension to complete | |
710 | |
711 if (!pending) { | |
712 // A cancelled suspend request is the only false return from | |
713 // is_ext_suspend_completed() that keeps us from entering the | |
714 // retry loop. | |
715 *bits |= 0x00020000; | |
716 return false; | |
717 } | |
718 | |
719 if (is_suspended) { | |
720 *bits |= 0x00040000; | |
721 return true; | |
722 } | |
723 | |
724 for (int i = 1; i <= retries; i++) { | |
725 *bits = reset_bits; // reinit to only track last retry | |
726 | |
727 // We used to do an "os::yield_all(i)" call here with the intention | |
728 // that yielding would increase on each retry. However, the parameter | |
729 // is ignored on Linux which means the yield didn't scale up. Waiting | |
730 // on the SR_lock below provides a much more predictable scale up for | |
731 // the delay. It also provides a simple/direct point to check for any | |
732 // safepoint requests from the VMThread | |
733 | |
734 { | |
735 MutexLocker ml(SR_lock()); | |
736 // wait with safepoint check (if we're a JavaThread - the WatcherThread | |
737 // can also call this) and increase delay with each retry | |
738 SR_lock()->wait(!Thread::current()->is_Java_thread(), i * delay); | |
739 | |
740 is_suspended = is_ext_suspend_completed(true /* called_by_wait */, | |
741 delay, bits); | |
742 | |
743 // It is possible for the external suspend request to be cancelled | |
744 // (by a resume) before the actual suspend operation is completed. | |
745 // Refresh our local copy to see if we still need to wait. | |
746 pending = is_external_suspend(); | |
747 } | |
748 | |
749 if (!pending) { | |
750 // A cancelled suspend request is the only false return from | |
751 // is_ext_suspend_completed() that keeps us from staying in the | |
752 // retry loop. | |
753 *bits |= 0x00080000; | |
754 return false; | |
755 } | |
756 | |
757 if (is_suspended) { | |
758 *bits |= 0x00100000; | |
759 return true; | |
760 } | |
761 } // end retry loop | |
762 | |
763 // thread did not suspend after all our retries | |
764 *bits |= 0x00200000; | |
765 return false; | |
766 } | |
767 | |
768 #ifndef PRODUCT | |
769 void JavaThread::record_jump(address target, address instr, const char* file, int line) { | |
770 | |
771 // This should not need to be atomic as the only way for simultaneous | |
772 // updates is via interrupts. Even then this should be rare or non-existant | |
773 // and we don't care that much anyway. | |
774 | |
775 int index = _jmp_ring_index; | |
776 _jmp_ring_index = (index + 1 ) & (jump_ring_buffer_size - 1); | |
777 _jmp_ring[index]._target = (intptr_t) target; | |
778 _jmp_ring[index]._instruction = (intptr_t) instr; | |
779 _jmp_ring[index]._file = file; | |
780 _jmp_ring[index]._line = line; | |
781 } | |
782 #endif /* PRODUCT */ | |
783 | |
784 // Called by flat profiler | |
785 // Callers have already called wait_for_ext_suspend_completion | |
786 // The assertion for that is currently too complex to put here: | |
787 bool JavaThread::profile_last_Java_frame(frame* _fr) { | |
788 bool gotframe = false; | |
789 // self suspension saves needed state. | |
790 if (has_last_Java_frame() && _anchor.walkable()) { | |
791 *_fr = pd_last_frame(); | |
792 gotframe = true; | |
793 } | |
794 return gotframe; | |
795 } | |
796 | |
797 void Thread::interrupt(Thread* thread) { | |
798 trace("interrupt", thread); | |
799 debug_only(check_for_dangling_thread_pointer(thread);) | |
800 os::interrupt(thread); | |
801 } | |
802 | |
803 bool Thread::is_interrupted(Thread* thread, bool clear_interrupted) { | |
804 trace("is_interrupted", thread); | |
805 debug_only(check_for_dangling_thread_pointer(thread);) | |
806 // Note: If clear_interrupted==false, this simply fetches and | |
807 // returns the value of the field osthread()->interrupted(). | |
808 return os::is_interrupted(thread, clear_interrupted); | |
809 } | |
810 | |
811 | |
812 // GC Support | |
813 bool Thread::claim_oops_do_par_case(int strong_roots_parity) { | |
814 jint thread_parity = _oops_do_parity; | |
815 if (thread_parity != strong_roots_parity) { | |
816 jint res = Atomic::cmpxchg(strong_roots_parity, &_oops_do_parity, thread_parity); | |
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817 if (res == thread_parity) { |
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818 return true; |
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819 } else { |
0 | 820 guarantee(res == strong_roots_parity, "Or else what?"); |
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821 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
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822 "Should only fail when parallel."); |
0 | 823 return false; |
824 } | |
825 } | |
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826 assert(SharedHeap::heap()->workers()->active_workers() > 0, |
0 | 827 "Should only fail when parallel."); |
828 return false; | |
829 } | |
830 | |
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831 void Thread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 832 active_handles()->oops_do(f); |
833 // Do oop for ThreadShadow | |
834 f->do_oop((oop*)&_pending_exception); | |
835 handle_area()->oops_do(f); | |
836 } | |
837 | |
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838 void Thread::nmethods_do(CodeBlobClosure* cf) { |
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839 // no nmethods in a generic thread... |
0 | 840 } |
841 | |
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842 void Thread::metadata_do(void f(Metadata*)) { |
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843 if (metadata_handles() != NULL) { |
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844 for (int i = 0; i< metadata_handles()->length(); i++) { |
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845 f(metadata_handles()->at(i)); |
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846 } |
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847 } |
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848 } |
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849 |
0 | 850 void Thread::print_on(outputStream* st) const { |
851 // get_priority assumes osthread initialized | |
852 if (osthread() != NULL) { | |
6766 | 853 int os_prio; |
854 if (os::get_native_priority(this, &os_prio) == OS_OK) { | |
855 st->print("os_prio=%d ", os_prio); | |
856 } | |
857 st->print("tid=" INTPTR_FORMAT " ", this); | |
0 | 858 osthread()->print_on(st); |
859 } | |
860 debug_only(if (WizardMode) print_owned_locks_on(st);) | |
861 } | |
862 | |
863 // Thread::print_on_error() is called by fatal error handler. Don't use | |
864 // any lock or allocate memory. | |
865 void Thread::print_on_error(outputStream* st, char* buf, int buflen) const { | |
866 if (is_VM_thread()) st->print("VMThread"); | |
867 else if (is_Compiler_thread()) st->print("CompilerThread"); | |
868 else if (is_Java_thread()) st->print("JavaThread"); | |
869 else if (is_GC_task_thread()) st->print("GCTaskThread"); | |
870 else if (is_Watcher_thread()) st->print("WatcherThread"); | |
871 else if (is_ConcurrentGC_thread()) st->print("ConcurrentGCThread"); | |
872 else st->print("Thread"); | |
873 | |
874 st->print(" [stack: " PTR_FORMAT "," PTR_FORMAT "]", | |
875 _stack_base - _stack_size, _stack_base); | |
876 | |
877 if (osthread()) { | |
878 st->print(" [id=%d]", osthread()->thread_id()); | |
879 } | |
880 } | |
881 | |
882 #ifdef ASSERT | |
883 void Thread::print_owned_locks_on(outputStream* st) const { | |
884 Monitor *cur = _owned_locks; | |
885 if (cur == NULL) { | |
886 st->print(" (no locks) "); | |
887 } else { | |
888 st->print_cr(" Locks owned:"); | |
889 while(cur) { | |
890 cur->print_on(st); | |
891 cur = cur->next(); | |
892 } | |
893 } | |
894 } | |
895 | |
896 static int ref_use_count = 0; | |
897 | |
898 bool Thread::owns_locks_but_compiled_lock() const { | |
899 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
900 if (cur != Compile_lock) return true; | |
901 } | |
902 return false; | |
903 } | |
904 | |
905 | |
906 #endif | |
907 | |
908 #ifndef PRODUCT | |
909 | |
910 // The flag: potential_vm_operation notifies if this particular safepoint state could potential | |
911 // invoke the vm-thread (i.e., and oop allocation). In that case, we also have to make sure that | |
912 // no threads which allow_vm_block's are held | |
913 void Thread::check_for_valid_safepoint_state(bool potential_vm_operation) { | |
914 // Check if current thread is allowed to block at a safepoint | |
915 if (!(_allow_safepoint_count == 0)) | |
916 fatal("Possible safepoint reached by thread that does not allow it"); | |
917 if (is_Java_thread() && ((JavaThread*)this)->thread_state() != _thread_in_vm) { | |
918 fatal("LEAF method calling lock?"); | |
919 } | |
920 | |
921 #ifdef ASSERT | |
922 if (potential_vm_operation && is_Java_thread() | |
923 && !Universe::is_bootstrapping()) { | |
924 // Make sure we do not hold any locks that the VM thread also uses. | |
925 // This could potentially lead to deadlocks | |
926 for(Monitor *cur = _owned_locks; cur; cur = cur->next()) { | |
927 // Threads_lock is special, since the safepoint synchronization will not start before this is | |
928 // acquired. Hence, a JavaThread cannot be holding it at a safepoint. So is VMOperationRequest_lock, | |
929 // since it is used to transfer control between JavaThreads and the VMThread | |
930 // Do not *exclude* any locks unless you are absolutly sure it is correct. Ask someone else first! | |
931 if ( (cur->allow_vm_block() && | |
932 cur != Threads_lock && | |
933 cur != Compile_lock && // Temporary: should not be necessary when we get spearate compilation | |
934 cur != VMOperationRequest_lock && | |
935 cur != VMOperationQueue_lock) || | |
936 cur->rank() == Mutex::special) { | |
937 warning("Thread holding lock at safepoint that vm can block on: %s", cur->name()); | |
938 } | |
939 } | |
940 } | |
941 | |
942 if (GCALotAtAllSafepoints) { | |
943 // We could enter a safepoint here and thus have a gc | |
944 InterfaceSupport::check_gc_alot(); | |
945 } | |
946 #endif | |
947 } | |
948 #endif | |
949 | |
950 bool Thread::is_in_stack(address adr) const { | |
951 assert(Thread::current() == this, "is_in_stack can only be called from current thread"); | |
952 address end = os::current_stack_pointer(); | |
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953 // Allow non Java threads to call this without stack_base |
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954 if (_stack_base == NULL) return true; |
0 | 955 if (stack_base() >= adr && adr >= end) return true; |
956 | |
957 return false; | |
958 } | |
959 | |
960 | |
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961 bool Thread::is_in_usable_stack(address adr) const { |
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962 size_t stack_guard_size = os::uses_stack_guard_pages() ? (StackYellowPages + StackRedPages) * os::vm_page_size() : 0; |
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963 size_t usable_stack_size = _stack_size - stack_guard_size; |
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964 |
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965 return ((adr < stack_base()) && (adr >= stack_base() - usable_stack_size)); |
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966 } |
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967 |
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968 |
0 | 969 // We had to move these methods here, because vm threads get into ObjectSynchronizer::enter |
970 // However, there is a note in JavaThread::is_lock_owned() about the VM threads not being | |
971 // used for compilation in the future. If that change is made, the need for these methods | |
972 // should be revisited, and they should be removed if possible. | |
973 | |
974 bool Thread::is_lock_owned(address adr) const { | |
1688
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975 return on_local_stack(adr); |
0 | 976 } |
977 | |
978 bool Thread::set_as_starting_thread() { | |
979 // NOTE: this must be called inside the main thread. | |
980 return os::create_main_thread((JavaThread*)this); | |
981 } | |
982 | |
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983 static void initialize_class(Symbol* class_name, TRAPS) { |
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984 Klass* klass = SystemDictionary::resolve_or_fail(class_name, true, CHECK); |
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985 InstanceKlass::cast(klass)->initialize(CHECK); |
0 | 986 } |
987 | |
988 | |
989 // Creates the initial ThreadGroup | |
990 static Handle create_initial_thread_group(TRAPS) { | |
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991 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_ThreadGroup(), true, CHECK_NH); |
0 | 992 instanceKlassHandle klass (THREAD, k); |
993 | |
994 Handle system_instance = klass->allocate_instance_handle(CHECK_NH); | |
995 { | |
996 JavaValue result(T_VOID); | |
997 JavaCalls::call_special(&result, | |
998 system_instance, | |
999 klass, | |
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1000 vmSymbols::object_initializer_name(), |
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1001 vmSymbols::void_method_signature(), |
0 | 1002 CHECK_NH); |
1003 } | |
1004 Universe::set_system_thread_group(system_instance()); | |
1005 | |
1006 Handle main_instance = klass->allocate_instance_handle(CHECK_NH); | |
1007 { | |
1008 JavaValue result(T_VOID); | |
1009 Handle string = java_lang_String::create_from_str("main", CHECK_NH); | |
1010 JavaCalls::call_special(&result, | |
1011 main_instance, | |
1012 klass, | |
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1013 vmSymbols::object_initializer_name(), |
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1014 vmSymbols::threadgroup_string_void_signature(), |
0 | 1015 system_instance, |
1016 string, | |
1017 CHECK_NH); | |
1018 } | |
1019 return main_instance; | |
1020 } | |
1021 | |
1022 // Creates the initial Thread | |
1023 static oop create_initial_thread(Handle thread_group, JavaThread* thread, TRAPS) { | |
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1024 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK_NULL); |
0 | 1025 instanceKlassHandle klass (THREAD, k); |
1026 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK_NULL); | |
1027 | |
1028 java_lang_Thread::set_thread(thread_oop(), thread); | |
1029 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1030 thread->set_threadObj(thread_oop()); | |
1031 | |
1032 Handle string = java_lang_String::create_from_str("main", CHECK_NULL); | |
1033 | |
1034 JavaValue result(T_VOID); | |
1035 JavaCalls::call_special(&result, thread_oop, | |
1036 klass, | |
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1037 vmSymbols::object_initializer_name(), |
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1038 vmSymbols::threadgroup_string_void_signature(), |
0 | 1039 thread_group, |
1040 string, | |
1041 CHECK_NULL); | |
1042 return thread_oop(); | |
1043 } | |
1044 | |
1045 static void call_initializeSystemClass(TRAPS) { | |
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1046 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1047 instanceKlassHandle klass (THREAD, k); |
1048 | |
1049 JavaValue result(T_VOID); | |
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1050 JavaCalls::call_static(&result, klass, vmSymbols::initializeSystemClass_name(), |
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1051 vmSymbols::void_method_signature(), CHECK); |
0 | 1052 } |
1053 | |
6181 | 1054 char java_runtime_name[128] = ""; |
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1055 char java_runtime_version[128] = ""; |
6181 | 1056 |
1057 // extract the JRE name from sun.misc.Version.java_runtime_name | |
1058 static const char* get_java_runtime_name(TRAPS) { | |
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1059 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
6181 | 1060 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
1061 fieldDescriptor fd; | |
1062 bool found = k != NULL && | |
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1063 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_name_name(), |
6181 | 1064 vmSymbols::string_signature(), &fd); |
1065 if (found) { | |
1066 oop name_oop = k->java_mirror()->obj_field(fd.offset()); | |
1067 if (name_oop == NULL) | |
1068 return NULL; | |
1069 const char* name = java_lang_String::as_utf8_string(name_oop, | |
1070 java_runtime_name, | |
1071 sizeof(java_runtime_name)); | |
1072 return name; | |
1073 } else { | |
1074 return NULL; | |
1075 } | |
1076 } | |
1077 | |
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1078 // extract the JRE version from sun.misc.Version.java_runtime_version |
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1079 static const char* get_java_runtime_version(TRAPS) { |
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1080 Klass* k = SystemDictionary::find(vmSymbols::sun_misc_Version(), |
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1081 Handle(), Handle(), CHECK_AND_CLEAR_NULL); |
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1082 fieldDescriptor fd; |
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1083 bool found = k != NULL && |
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1084 InstanceKlass::cast(k)->find_local_field(vmSymbols::java_runtime_version_name(), |
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1085 vmSymbols::string_signature(), &fd); |
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1086 if (found) { |
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1087 oop name_oop = k->java_mirror()->obj_field(fd.offset()); |
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1088 if (name_oop == NULL) |
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1089 return NULL; |
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1090 const char* name = java_lang_String::as_utf8_string(name_oop, |
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1091 java_runtime_version, |
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1092 sizeof(java_runtime_version)); |
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1093 return name; |
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1094 } else { |
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1095 return NULL; |
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1096 } |
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1097 } |
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1098 |
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1099 // General purpose hook into Java code, run once when the VM is initialized. |
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1100 // The Java library method itself may be changed independently from the VM. |
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1101 static void call_postVMInitHook(TRAPS) { |
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1102 Klass* k = SystemDictionary::PostVMInitHook_klass(); |
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1103 instanceKlassHandle klass (THREAD, k); |
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1104 if (klass.not_null()) { |
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1105 JavaValue result(T_VOID); |
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1106 JavaCalls::call_static(&result, klass, vmSymbols::run_method_name(), |
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1107 vmSymbols::void_method_signature(), |
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1108 CHECK); |
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1109 } |
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1110 } |
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1111 |
0 | 1112 static void reset_vm_info_property(TRAPS) { |
1113 // the vm info string | |
1114 ResourceMark rm(THREAD); | |
1115 const char *vm_info = VM_Version::vm_info_string(); | |
1116 | |
1117 // java.lang.System class | |
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1118 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_System(), true, CHECK); |
0 | 1119 instanceKlassHandle klass (THREAD, k); |
1120 | |
1121 // setProperty arguments | |
1122 Handle key_str = java_lang_String::create_from_str("java.vm.info", CHECK); | |
1123 Handle value_str = java_lang_String::create_from_str(vm_info, CHECK); | |
1124 | |
1125 // return value | |
1126 JavaValue r(T_OBJECT); | |
1127 | |
1128 // public static String setProperty(String key, String value); | |
1129 JavaCalls::call_static(&r, | |
1130 klass, | |
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1131 vmSymbols::setProperty_name(), |
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1132 vmSymbols::string_string_string_signature(), |
0 | 1133 key_str, |
1134 value_str, | |
1135 CHECK); | |
1136 } | |
1137 | |
1138 | |
1139 void JavaThread::allocate_threadObj(Handle thread_group, char* thread_name, bool daemon, TRAPS) { | |
1140 assert(thread_group.not_null(), "thread group should be specified"); | |
1141 assert(threadObj() == NULL, "should only create Java thread object once"); | |
1142 | |
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1143 Klass* k = SystemDictionary::resolve_or_fail(vmSymbols::java_lang_Thread(), true, CHECK); |
0 | 1144 instanceKlassHandle klass (THREAD, k); |
1145 instanceHandle thread_oop = klass->allocate_instance_handle(CHECK); | |
1146 | |
1147 java_lang_Thread::set_thread(thread_oop(), this); | |
1148 java_lang_Thread::set_priority(thread_oop(), NormPriority); | |
1149 set_threadObj(thread_oop()); | |
1150 | |
1151 JavaValue result(T_VOID); | |
1152 if (thread_name != NULL) { | |
1153 Handle name = java_lang_String::create_from_str(thread_name, CHECK); | |
1154 // Thread gets assigned specified name and null target | |
1155 JavaCalls::call_special(&result, | |
1156 thread_oop, | |
1157 klass, | |
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1158 vmSymbols::object_initializer_name(), |
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1159 vmSymbols::threadgroup_string_void_signature(), |
0 | 1160 thread_group, // Argument 1 |
1161 name, // Argument 2 | |
1162 THREAD); | |
1163 } else { | |
1164 // Thread gets assigned name "Thread-nnn" and null target | |
1165 // (java.lang.Thread doesn't have a constructor taking only a ThreadGroup argument) | |
1166 JavaCalls::call_special(&result, | |
1167 thread_oop, | |
1168 klass, | |
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1169 vmSymbols::object_initializer_name(), |
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1170 vmSymbols::threadgroup_runnable_void_signature(), |
0 | 1171 thread_group, // Argument 1 |
1172 Handle(), // Argument 2 | |
1173 THREAD); | |
1174 } | |
1175 | |
1176 | |
1177 if (daemon) { | |
1178 java_lang_Thread::set_daemon(thread_oop()); | |
1179 } | |
1180 | |
1181 if (HAS_PENDING_EXCEPTION) { | |
1182 return; | |
1183 } | |
1184 | |
1142 | 1185 KlassHandle group(this, SystemDictionary::ThreadGroup_klass()); |
0 | 1186 Handle threadObj(this, this->threadObj()); |
1187 | |
1188 JavaCalls::call_special(&result, | |
1189 thread_group, | |
1190 group, | |
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1191 vmSymbols::add_method_name(), |
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1192 vmSymbols::thread_void_signature(), |
0 | 1193 threadObj, // Arg 1 |
1194 THREAD); | |
1195 | |
1196 | |
1197 } | |
1198 | |
1199 // NamedThread -- non-JavaThread subclasses with multiple | |
1200 // uniquely named instances should derive from this. | |
1201 NamedThread::NamedThread() : Thread() { | |
1202 _name = NULL; | |
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1203 _processed_thread = NULL; |
0 | 1204 } |
1205 | |
1206 NamedThread::~NamedThread() { | |
1207 if (_name != NULL) { | |
6197 | 1208 FREE_C_HEAP_ARRAY(char, _name, mtThread); |
0 | 1209 _name = NULL; |
1210 } | |
1211 } | |
1212 | |
1213 void NamedThread::set_name(const char* format, ...) { | |
1214 guarantee(_name == NULL, "Only get to set name once."); | |
6197 | 1215 _name = NEW_C_HEAP_ARRAY(char, max_name_len, mtThread); |
0 | 1216 guarantee(_name != NULL, "alloc failure"); |
1217 va_list ap; | |
1218 va_start(ap, format); | |
1219 jio_vsnprintf(_name, max_name_len, format, ap); | |
1220 va_end(ap); | |
1221 } | |
1222 | |
1223 // ======= WatcherThread ======== | |
1224 | |
1225 // The watcher thread exists to simulate timer interrupts. It should | |
1226 // be replaced by an abstraction over whatever native support for | |
1227 // timer interrupts exists on the platform. | |
1228 | |
1229 WatcherThread* WatcherThread::_watcher_thread = NULL; | |
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1230 bool WatcherThread::_startable = false; |
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1231 volatile bool WatcherThread::_should_terminate = false; |
0 | 1232 |
11151 | 1233 WatcherThread::WatcherThread() : Thread(), _crash_protection(NULL) { |
0 | 1234 assert(watcher_thread() == NULL, "we can only allocate one WatcherThread"); |
1235 if (os::create_thread(this, os::watcher_thread)) { | |
1236 _watcher_thread = this; | |
1237 | |
1238 // Set the watcher thread to the highest OS priority which should not be | |
1239 // used, unless a Java thread with priority java.lang.Thread.MAX_PRIORITY | |
1240 // is created. The only normal thread using this priority is the reference | |
1241 // handler thread, which runs for very short intervals only. | |
1242 // If the VMThread's priority is not lower than the WatcherThread profiling | |
1243 // will be inaccurate. | |
1244 os::set_priority(this, MaxPriority); | |
1245 if (!DisableStartThread) { | |
1246 os::start_thread(this); | |
1247 } | |
1248 } | |
1249 } | |
1250 | |
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1251 int WatcherThread::sleep() const { |
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1252 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1253 |
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1254 // remaining will be zero if there are no tasks, |
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1255 // causing the WatcherThread to sleep until a task is |
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1256 // enrolled |
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1257 int remaining = PeriodicTask::time_to_wait(); |
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1258 int time_slept = 0; |
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1259 |
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1260 // we expect this to timeout - we only ever get unparked when |
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1261 // we should terminate or when a new task has been enrolled |
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1262 OSThreadWaitState osts(this->osthread(), false /* not Object.wait() */); |
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1263 |
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1264 jlong time_before_loop = os::javaTimeNanos(); |
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1265 |
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1266 for (;;) { |
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1267 bool timedout = PeriodicTask_lock->wait(Mutex::_no_safepoint_check_flag, remaining); |
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1268 jlong now = os::javaTimeNanos(); |
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1269 |
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1270 if (remaining == 0) { |
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1271 // if we didn't have any tasks we could have waited for a long time |
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1272 // consider the time_slept zero and reset time_before_loop |
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1273 time_slept = 0; |
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1274 time_before_loop = now; |
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1275 } else { |
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1276 // need to recalulate since we might have new tasks in _tasks |
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1277 time_slept = (int) ((now - time_before_loop) / 1000000); |
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1278 } |
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1279 |
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1280 // Change to task list or spurious wakeup of some kind |
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1281 if (timedout || _should_terminate) { |
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1282 break; |
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1283 } |
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1284 |
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1285 remaining = PeriodicTask::time_to_wait(); |
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1286 if (remaining == 0) { |
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1287 // Last task was just disenrolled so loop around and wait until |
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1288 // another task gets enrolled |
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1289 continue; |
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1290 } |
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1291 |
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1292 remaining -= time_slept; |
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1293 if (remaining <= 0) |
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1294 break; |
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1295 } |
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1296 |
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1297 return time_slept; |
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1298 } |
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1299 |
0 | 1300 void WatcherThread::run() { |
1301 assert(this == watcher_thread(), "just checking"); | |
1302 | |
1303 this->record_stack_base_and_size(); | |
1304 this->initialize_thread_local_storage(); | |
1305 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1306 while(!_should_terminate) { | |
1307 assert(watcher_thread() == Thread::current(), "thread consistency check"); | |
1308 assert(watcher_thread() == this, "thread consistency check"); | |
1309 | |
1310 // Calculate how long it'll be until the next PeriodicTask work | |
1311 // should be done, and sleep that amount of time. | |
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1312 int time_waited = sleep(); |
0 | 1313 |
1314 if (is_error_reported()) { | |
1315 // A fatal error has happened, the error handler(VMError::report_and_die) | |
1316 // should abort JVM after creating an error log file. However in some | |
1317 // rare cases, the error handler itself might deadlock. Here we try to | |
1318 // kill JVM if the fatal error handler fails to abort in 2 minutes. | |
1319 // | |
1320 // This code is in WatcherThread because WatcherThread wakes up | |
1321 // periodically so the fatal error handler doesn't need to do anything; | |
1322 // also because the WatcherThread is less likely to crash than other | |
1323 // threads. | |
1324 | |
1325 for (;;) { | |
1326 if (!ShowMessageBoxOnError | |
1327 && (OnError == NULL || OnError[0] == '\0') | |
1328 && Arguments::abort_hook() == NULL) { | |
1329 os::sleep(this, 2 * 60 * 1000, false); | |
1330 fdStream err(defaultStream::output_fd()); | |
1331 err.print_raw_cr("# [ timer expired, abort... ]"); | |
1332 // skip atexit/vm_exit/vm_abort hooks | |
1333 os::die(); | |
1334 } | |
1335 | |
1336 // Wake up 5 seconds later, the fatal handler may reset OnError or | |
1337 // ShowMessageBoxOnError when it is ready to abort. | |
1338 os::sleep(this, 5 * 1000, false); | |
1339 } | |
1340 } | |
1341 | |
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1342 PeriodicTask::real_time_tick(time_waited); |
0 | 1343 } |
1344 | |
1345 // Signal that it is terminated | |
1346 { | |
1347 MutexLockerEx mu(Terminator_lock, Mutex::_no_safepoint_check_flag); | |
1348 _watcher_thread = NULL; | |
1349 Terminator_lock->notify(); | |
1350 } | |
1351 | |
1352 // Thread destructor usually does this.. | |
1353 ThreadLocalStorage::set_thread(NULL); | |
1354 } | |
1355 | |
1356 void WatcherThread::start() { | |
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1357 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1358 |
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1359 if (watcher_thread() == NULL && _startable) { |
0 | 1360 _should_terminate = false; |
1361 // Create the single instance of WatcherThread | |
1362 new WatcherThread(); | |
1363 } | |
1364 } | |
1365 | |
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1366 void WatcherThread::make_startable() { |
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1367 assert(PeriodicTask_lock->owned_by_self(), "PeriodicTask_lock required"); |
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1368 _startable = true; |
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1369 } |
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1370 |
0 | 1371 void WatcherThread::stop() { |
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1372 { |
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1373 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1374 _should_terminate = true; |
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1375 OrderAccess::fence(); // ensure WatcherThread sees update in main loop |
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1376 |
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1377 WatcherThread* watcher = watcher_thread(); |
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1378 if (watcher != NULL) |
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1379 watcher->unpark(); |
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1380 } |
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1381 |
0 | 1382 // it is ok to take late safepoints here, if needed |
1383 MutexLocker mu(Terminator_lock); | |
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1384 |
0 | 1385 while(watcher_thread() != NULL) { |
1386 // This wait should make safepoint checks, wait without a timeout, | |
1387 // and wait as a suspend-equivalent condition. | |
1388 // | |
1389 // Note: If the FlatProfiler is running, then this thread is waiting | |
1390 // for the WatcherThread to terminate and the WatcherThread, via the | |
1391 // FlatProfiler task, is waiting for the external suspend request on | |
1392 // this thread to complete. wait_for_ext_suspend_completion() will | |
1393 // eventually timeout, but that takes time. Making this wait a | |
1394 // suspend-equivalent condition solves that timeout problem. | |
1395 // | |
1396 Terminator_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
1397 Mutex::_as_suspend_equivalent_flag); | |
1398 } | |
1399 } | |
1400 | |
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1401 void WatcherThread::unpark() { |
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1402 MutexLockerEx ml(PeriodicTask_lock->owned_by_self() ? NULL : PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
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1403 PeriodicTask_lock->notify(); |
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1404 } |
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1405 |
0 | 1406 void WatcherThread::print_on(outputStream* st) const { |
1407 st->print("\"%s\" ", name()); | |
1408 Thread::print_on(st); | |
1409 st->cr(); | |
1410 } | |
1411 | |
1412 // ======= JavaThread ======== | |
1413 | |
1414 // A JavaThread is a normal Java thread | |
1415 | |
1416 void JavaThread::initialize() { | |
1417 // Initialize fields | |
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1418 |
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1419 // Set the claimed par_id to -1 (ie not claiming any par_ids) |
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1420 set_claimed_par_id(-1); |
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1421 |
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1422 _buffer_blob = NULL; |
0 | 1423 set_saved_exception_pc(NULL); |
1424 set_threadObj(NULL); | |
1425 _anchor.clear(); | |
1426 set_entry_point(NULL); | |
1427 set_jni_functions(jni_functions()); | |
1428 set_callee_target(NULL); | |
1429 set_vm_result(NULL); | |
1430 set_vm_result_2(NULL); | |
1431 set_vframe_array_head(NULL); | |
1432 set_vframe_array_last(NULL); | |
1433 set_deferred_locals(NULL); | |
1434 set_deopt_mark(NULL); | |
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1435 set_deopt_nmethod(NULL); |
0 | 1436 clear_must_deopt_id(); |
1437 set_monitor_chunks(NULL); | |
1438 set_next(NULL); | |
1439 set_thread_state(_thread_new); | |
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1440 #if INCLUDE_NMT |
6197 | 1441 set_recorder(NULL); |
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1442 #endif |
0 | 1443 _terminated = _not_terminated; |
1444 _privileged_stack_top = NULL; | |
1445 _array_for_gc = NULL; | |
1446 _suspend_equivalent = false; | |
1447 _in_deopt_handler = 0; | |
1448 _doing_unsafe_access = false; | |
1449 _stack_guard_state = stack_guard_unused; | |
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|
1450 #ifdef GRAAL |
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|
1451 _graal_alternate_call_target = NULL; |
5747
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1452 #endif |
0 | 1453 _exception_oop = NULL; |
1454 _exception_pc = 0; | |
1455 _exception_handler_pc = 0; | |
1903 | 1456 _is_method_handle_return = 0; |
0 | 1457 _jvmti_thread_state= NULL; |
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1458 _should_post_on_exceptions_flag = JNI_FALSE; |
0 | 1459 _jvmti_get_loaded_classes_closure = NULL; |
1460 _interp_only_mode = 0; | |
1461 _special_runtime_exit_condition = _no_async_condition; | |
1462 _pending_async_exception = NULL; | |
1463 _is_compiling = false; | |
1464 _thread_stat = NULL; | |
1465 _thread_stat = new ThreadStatistics(); | |
1466 _blocked_on_compilation = false; | |
1467 _jni_active_critical = 0; | |
1468 _do_not_unlock_if_synchronized = false; | |
1469 _cached_monitor_info = NULL; | |
1470 _parker = Parker::Allocate(this) ; | |
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|
1471 _scanned_nmethod = NULL; |
0 | 1472 |
1473 #ifndef PRODUCT | |
1474 _jmp_ring_index = 0; | |
1475 for (int ji = 0 ; ji < jump_ring_buffer_size ; ji++ ) { | |
1476 record_jump(NULL, NULL, NULL, 0); | |
1477 } | |
1478 #endif /* PRODUCT */ | |
1479 | |
1480 set_thread_profiler(NULL); | |
1481 if (FlatProfiler::is_active()) { | |
1482 // This is where we would decide to either give each thread it's own profiler | |
1483 // or use one global one from FlatProfiler, | |
1484 // or up to some count of the number of profiled threads, etc. | |
1485 ThreadProfiler* pp = new ThreadProfiler(); | |
1486 pp->engage(); | |
1487 set_thread_profiler(pp); | |
1488 } | |
1489 | |
1490 // Setup safepoint state info for this thread | |
1491 ThreadSafepointState::create(this); | |
1492 | |
1493 debug_only(_java_call_counter = 0); | |
1494 | |
1495 // JVMTI PopFrame support | |
1496 _popframe_condition = popframe_inactive; | |
1497 _popframe_preserved_args = NULL; | |
1498 _popframe_preserved_args_size = 0; | |
1499 | |
1500 pd_initialize(); | |
1501 } | |
1502 | |
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1503 #if INCLUDE_ALL_GCS |
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1504 SATBMarkQueueSet JavaThread::_satb_mark_queue_set; |
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1505 DirtyCardQueueSet JavaThread::_dirty_card_queue_set; |
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1506 #endif // INCLUDE_ALL_GCS |
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1507 |
4006 | 1508 JavaThread::JavaThread(bool is_attaching_via_jni) : |
342
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1509 Thread() |
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1510 #if INCLUDE_ALL_GCS |
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1511 , _satb_mark_queue(&_satb_mark_queue_set), |
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1512 _dirty_card_queue(&_dirty_card_queue_set) |
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1513 #endif // INCLUDE_ALL_GCS |
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1514 { |
0 | 1515 initialize(); |
4006 | 1516 if (is_attaching_via_jni) { |
1517 _jni_attach_state = _attaching_via_jni; | |
1518 } else { | |
1519 _jni_attach_state = _not_attaching_via_jni; | |
1520 } | |
8011
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|
1521 assert(deferred_card_mark().is_empty(), "Default MemRegion ctor"); |
6197 | 1522 _safepoint_visible = false; |
0 | 1523 } |
1524 | |
1525 bool JavaThread::reguard_stack(address cur_sp) { | |
1526 if (_stack_guard_state != stack_guard_yellow_disabled) { | |
1527 return true; // Stack already guarded or guard pages not needed. | |
1528 } | |
1529 | |
1530 if (register_stack_overflow()) { | |
1531 // For those architectures which have separate register and | |
1532 // memory stacks, we must check the register stack to see if | |
1533 // it has overflowed. | |
1534 return false; | |
1535 } | |
1536 | |
1537 // Java code never executes within the yellow zone: the latter is only | |
1538 // there to provoke an exception during stack banging. If java code | |
1539 // is executing there, either StackShadowPages should be larger, or | |
1540 // some exception code in c1, c2 or the interpreter isn't unwinding | |
1541 // when it should. | |
1542 guarantee(cur_sp > stack_yellow_zone_base(), "not enough space to reguard - increase StackShadowPages"); | |
1543 | |
1544 enable_stack_yellow_zone(); | |
1545 return true; | |
1546 } | |
1547 | |
1548 bool JavaThread::reguard_stack(void) { | |
1549 return reguard_stack(os::current_stack_pointer()); | |
1550 } | |
1551 | |
1552 | |
1553 void JavaThread::block_if_vm_exited() { | |
1554 if (_terminated == _vm_exited) { | |
1555 // _vm_exited is set at safepoint, and Threads_lock is never released | |
1556 // we will block here forever | |
1557 Threads_lock->lock_without_safepoint_check(); | |
1558 ShouldNotReachHere(); | |
1559 } | |
1560 } | |
1561 | |
1562 | |
1563 // Remove this ifdef when C1 is ported to the compiler interface. | |
1564 static void compiler_thread_entry(JavaThread* thread, TRAPS); | |
1565 | |
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1566 JavaThread::JavaThread(ThreadFunction entry_point, size_t stack_sz) : |
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1567 Thread() |
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1568 #if INCLUDE_ALL_GCS |
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1569 , _satb_mark_queue(&_satb_mark_queue_set), |
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1570 _dirty_card_queue(&_dirty_card_queue_set) |
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1571 #endif // INCLUDE_ALL_GCS |
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1572 { |
0 | 1573 if (TraceThreadEvents) { |
1574 tty->print_cr("creating thread %p", this); | |
1575 } | |
1576 initialize(); | |
4006 | 1577 _jni_attach_state = _not_attaching_via_jni; |
0 | 1578 set_entry_point(entry_point); |
1579 // Create the native thread itself. | |
1580 // %note runtime_23 | |
1581 os::ThreadType thr_type = os::java_thread; | |
1582 thr_type = entry_point == &compiler_thread_entry ? os::compiler_thread : | |
1583 os::java_thread; | |
1584 os::create_thread(this, thr_type, stack_sz); | |
6197 | 1585 _safepoint_visible = false; |
0 | 1586 // The _osthread may be NULL here because we ran out of memory (too many threads active). |
1587 // We need to throw and OutOfMemoryError - however we cannot do this here because the caller | |
1588 // may hold a lock and all locks must be unlocked before throwing the exception (throwing | |
1589 // the exception consists of creating the exception object & initializing it, initialization | |
1590 // will leave the VM via a JavaCall and then all locks must be unlocked). | |
1591 // | |
1592 // The thread is still suspended when we reach here. Thread must be explicit started | |
1593 // by creator! Furthermore, the thread must also explicitly be added to the Threads list | |
1594 // by calling Threads:add. The reason why this is not done here, is because the thread | |
1595 // object must be fully initialized (take a look at JVM_Start) | |
1596 } | |
1597 | |
1598 JavaThread::~JavaThread() { | |
1599 if (TraceThreadEvents) { | |
1600 tty->print_cr("terminate thread %p", this); | |
1601 } | |
1602 | |
6882
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7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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|
1603 // By now, this thread should already be invisible to safepoint, |
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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|
1604 // and its per-thread recorder also collected. |
6197 | 1605 assert(!is_safepoint_visible(), "wrong state"); |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
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|
1606 #if INCLUDE_NMT |
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|
1607 assert(get_recorder() == NULL, "Already collected"); |
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|
1608 #endif // INCLUDE_NMT |
6197 | 1609 |
0 | 1610 // JSR166 -- return the parker to the free list |
1611 Parker::Release(_parker); | |
1612 _parker = NULL ; | |
1613 | |
1614 // Free any remaining previous UnrollBlock | |
1615 vframeArray* old_array = vframe_array_last(); | |
1616 | |
1617 if (old_array != NULL) { | |
1618 Deoptimization::UnrollBlock* old_info = old_array->unroll_block(); | |
1619 old_array->set_unroll_block(NULL); | |
1620 delete old_info; | |
1621 delete old_array; | |
1622 } | |
1623 | |
1624 GrowableArray<jvmtiDeferredLocalVariableSet*>* deferred = deferred_locals(); | |
1625 if (deferred != NULL) { | |
1626 // This can only happen if thread is destroyed before deoptimization occurs. | |
1627 assert(deferred->length() != 0, "empty array!"); | |
1628 do { | |
1629 jvmtiDeferredLocalVariableSet* dlv = deferred->at(0); | |
1630 deferred->remove_at(0); | |
1631 // individual jvmtiDeferredLocalVariableSet are CHeapObj's | |
1632 delete dlv; | |
1633 } while (deferred->length() != 0); | |
1634 delete deferred; | |
1635 } | |
1636 | |
1637 // All Java related clean up happens in exit | |
1638 ThreadSafepointState::destroy(this); | |
1639 if (_thread_profiler != NULL) delete _thread_profiler; | |
1640 if (_thread_stat != NULL) delete _thread_stat; | |
1641 } | |
1642 | |
1643 | |
1644 // The first routine called by a new Java thread | |
1645 void JavaThread::run() { | |
1646 // initialize thread-local alloc buffer related fields | |
1647 this->initialize_tlab(); | |
1648 | |
1649 // used to test validitity of stack trace backs | |
1650 this->record_base_of_stack_pointer(); | |
1651 | |
1652 // Record real stack base and size. | |
1653 this->record_stack_base_and_size(); | |
1654 | |
1655 // Initialize thread local storage; set before calling MutexLocker | |
1656 this->initialize_thread_local_storage(); | |
1657 | |
1658 this->create_stack_guard_pages(); | |
1659 | |
1681
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diff
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|
1660 this->cache_global_variables(); |
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|
1661 |
0 | 1662 // Thread is now sufficient initialized to be handled by the safepoint code as being |
1663 // in the VM. Change thread state from _thread_new to _thread_in_vm | |
1664 ThreadStateTransition::transition_and_fence(this, _thread_new, _thread_in_vm); | |
1665 | |
1666 assert(JavaThread::current() == this, "sanity check"); | |
1667 assert(!Thread::current()->owns_locks(), "sanity check"); | |
1668 | |
1669 DTRACE_THREAD_PROBE(start, this); | |
1670 | |
1671 // This operation might block. We call that after all safepoint checks for a new thread has | |
1672 // been completed. | |
1673 this->set_active_handles(JNIHandleBlock::allocate_block()); | |
1674 | |
1675 if (JvmtiExport::should_post_thread_life()) { | |
1676 JvmtiExport::post_thread_start(this); | |
1677 } | |
1678 | |
10405 | 1679 EventThreadStart event; |
1680 if (event.should_commit()) { | |
1681 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1682 event.commit(); | |
1683 } | |
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diff
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|
1684 |
0 | 1685 // We call another function to do the rest so we are sure that the stack addresses used |
1686 // from there will be lower than the stack base just computed | |
1687 thread_main_inner(); | |
1688 | |
1689 // Note, thread is no longer valid at this point! | |
1690 } | |
1691 | |
1692 | |
1693 void JavaThread::thread_main_inner() { | |
1694 assert(JavaThread::current() == this, "sanity check"); | |
1695 assert(this->threadObj() != NULL, "just checking"); | |
1696 | |
2162
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|
1697 // Execute thread entry point unless this thread has a pending exception |
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|
1698 // or has been stopped before starting. |
0 | 1699 // Note: Due to JVM_StopThread we can have pending exceptions already! |
2162
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1700 if (!this->has_pending_exception() && |
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1701 !java_lang_Thread::is_stillborn(this->threadObj())) { |
4006 | 1702 { |
1703 ResourceMark rm(this); | |
1704 this->set_native_thread_name(this->get_thread_name()); | |
1705 } | |
0 | 1706 HandleMark hm(this); |
1707 this->entry_point()(this, this); | |
1708 } | |
1709 | |
1710 DTRACE_THREAD_PROBE(stop, this); | |
1711 | |
1712 this->exit(false); | |
1713 delete this; | |
1714 } | |
1715 | |
1716 | |
1717 static void ensure_join(JavaThread* thread) { | |
1718 // We do not need to grap the Threads_lock, since we are operating on ourself. | |
1719 Handle threadObj(thread, thread->threadObj()); | |
1720 assert(threadObj.not_null(), "java thread object must exist"); | |
1721 ObjectLocker lock(threadObj, thread); | |
1722 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1723 thread->clear_pending_exception(); | |
1724 // Thread is exiting. So set thread_status field in java.lang.Thread class to TERMINATED. | |
1725 java_lang_Thread::set_thread_status(threadObj(), java_lang_Thread::TERMINATED); | |
2162
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1726 // Clear the native thread instance - this makes isAlive return false and allows the join() |
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|
1727 // to complete once we've done the notify_all below |
0 | 1728 java_lang_Thread::set_thread(threadObj(), NULL); |
1729 lock.notify_all(thread); | |
1730 // Ignore pending exception (ThreadDeath), since we are exiting anyway | |
1731 thread->clear_pending_exception(); | |
1732 } | |
1733 | |
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|
1734 |
0 | 1735 // For any new cleanup additions, please check to see if they need to be applied to |
1736 // cleanup_failed_attach_current_thread as well. | |
1737 void JavaThread::exit(bool destroy_vm, ExitType exit_type) { | |
1738 assert(this == JavaThread::current(), "thread consistency check"); | |
1739 | |
1740 HandleMark hm(this); | |
1741 Handle uncaught_exception(this, this->pending_exception()); | |
1742 this->clear_pending_exception(); | |
1743 Handle threadObj(this, this->threadObj()); | |
1744 assert(threadObj.not_null(), "Java thread object should be created"); | |
1745 | |
1746 if (get_thread_profiler() != NULL) { | |
1747 get_thread_profiler()->disengage(); | |
1748 ResourceMark rm; | |
1749 get_thread_profiler()->print(get_thread_name()); | |
1750 } | |
1751 | |
1752 | |
1753 // FIXIT: This code should be moved into else part, when reliable 1.2/1.3 check is in place | |
1754 { | |
1755 EXCEPTION_MARK; | |
1756 | |
1757 CLEAR_PENDING_EXCEPTION; | |
1758 } | |
1759 // FIXIT: The is_null check is only so it works better on JDK1.2 VM's. This | |
1760 // has to be fixed by a runtime query method | |
1761 if (!destroy_vm || JDK_Version::is_jdk12x_version()) { | |
1762 // JSR-166: change call from from ThreadGroup.uncaughtException to | |
1763 // java.lang.Thread.dispatchUncaughtException | |
1764 if (uncaught_exception.not_null()) { | |
1765 Handle group(this, java_lang_Thread::threadGroup(threadObj())); | |
1766 { | |
1767 EXCEPTION_MARK; | |
1768 // Check if the method Thread.dispatchUncaughtException() exists. If so | |
1769 // call it. Otherwise we have an older library without the JSR-166 changes, | |
1770 // so call ThreadGroup.uncaughtException() | |
1771 KlassHandle recvrKlass(THREAD, threadObj->klass()); | |
1772 CallInfo callinfo; | |
1142 | 1773 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1774 LinkResolver::resolve_virtual_call(callinfo, threadObj, recvrKlass, thread_klass, |
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|
1775 vmSymbols::dispatchUncaughtException_name(), |
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|
1776 vmSymbols::throwable_void_signature(), |
0 | 1777 KlassHandle(), false, false, THREAD); |
1778 CLEAR_PENDING_EXCEPTION; | |
1779 methodHandle method = callinfo.selected_method(); | |
1780 if (method.not_null()) { | |
1781 JavaValue result(T_VOID); | |
1782 JavaCalls::call_virtual(&result, | |
1783 threadObj, thread_klass, | |
2177
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1784 vmSymbols::dispatchUncaughtException_name(), |
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1785 vmSymbols::throwable_void_signature(), |
0 | 1786 uncaught_exception, |
1787 THREAD); | |
1788 } else { | |
1142 | 1789 KlassHandle thread_group(THREAD, SystemDictionary::ThreadGroup_klass()); |
0 | 1790 JavaValue result(T_VOID); |
1791 JavaCalls::call_virtual(&result, | |
1792 group, thread_group, | |
2177
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1793 vmSymbols::uncaughtException_name(), |
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1794 vmSymbols::thread_throwable_void_signature(), |
0 | 1795 threadObj, // Arg 1 |
1796 uncaught_exception, // Arg 2 | |
1797 THREAD); | |
1798 } | |
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1799 if (HAS_PENDING_EXCEPTION) { |
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1800 ResourceMark rm(this); |
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1801 jio_fprintf(defaultStream::error_stream(), |
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1802 "\nException: %s thrown from the UncaughtExceptionHandler" |
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1803 " in thread \"%s\"\n", |
6983 | 1804 pending_exception()->klass()->external_name(), |
2200
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1805 get_thread_name()); |
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1806 CLEAR_PENDING_EXCEPTION; |
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1807 } |
0 | 1808 } |
1809 } | |
1810 | |
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1811 // Called before the java thread exit since we want to read info |
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1812 // from java_lang_Thread object |
10405 | 1813 EventThreadEnd event; |
1814 if (event.should_commit()) { | |
1815 event.set_javalangthread(java_lang_Thread::thread_id(this->threadObj())); | |
1816 event.commit(); | |
1817 } | |
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1818 |
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1819 // Call after last event on thread |
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1820 EVENT_THREAD_EXIT(this); |
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1821 |
0 | 1822 // Call Thread.exit(). We try 3 times in case we got another Thread.stop during |
1823 // the execution of the method. If that is not enough, then we don't really care. Thread.stop | |
1824 // is deprecated anyhow. | |
1825 { int count = 3; | |
1826 while (java_lang_Thread::threadGroup(threadObj()) != NULL && (count-- > 0)) { | |
1827 EXCEPTION_MARK; | |
1828 JavaValue result(T_VOID); | |
1142 | 1829 KlassHandle thread_klass(THREAD, SystemDictionary::Thread_klass()); |
0 | 1830 JavaCalls::call_virtual(&result, |
1831 threadObj, thread_klass, | |
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1832 vmSymbols::exit_method_name(), |
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1833 vmSymbols::void_method_signature(), |
0 | 1834 THREAD); |
1835 CLEAR_PENDING_EXCEPTION; | |
1836 } | |
1837 } | |
1838 | |
1839 // notify JVMTI | |
1840 if (JvmtiExport::should_post_thread_life()) { | |
1841 JvmtiExport::post_thread_end(this); | |
1842 } | |
1843 | |
1844 // We have notified the agents that we are exiting, before we go on, | |
1845 // we must check for a pending external suspend request and honor it | |
1846 // in order to not surprise the thread that made the suspend request. | |
1847 while (true) { | |
1848 { | |
1849 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
1850 if (!is_external_suspend()) { | |
1851 set_terminated(_thread_exiting); | |
1852 ThreadService::current_thread_exiting(this); | |
1853 break; | |
1854 } | |
1855 // Implied else: | |
1856 // Things get a little tricky here. We have a pending external | |
1857 // suspend request, but we are holding the SR_lock so we | |
1858 // can't just self-suspend. So we temporarily drop the lock | |
1859 // and then self-suspend. | |
1860 } | |
1861 | |
1862 ThreadBlockInVM tbivm(this); | |
1863 java_suspend_self(); | |
1864 | |
1865 // We're done with this suspend request, but we have to loop around | |
1866 // and check again. Eventually we will get SR_lock without a pending | |
1867 // external suspend request and will be able to mark ourselves as | |
1868 // exiting. | |
1869 } | |
1870 // no more external suspends are allowed at this point | |
1871 } else { | |
1872 // before_exit() has already posted JVMTI THREAD_END events | |
1873 } | |
1874 | |
1875 // Notify waiters on thread object. This has to be done after exit() is called | |
1876 // on the thread (if the thread is the last thread in a daemon ThreadGroup the | |
1877 // group should have the destroyed bit set before waiters are notified). | |
1878 ensure_join(this); | |
1879 assert(!this->has_pending_exception(), "ensure_join should have cleared"); | |
1880 | |
1881 // 6282335 JNI DetachCurrentThread spec states that all Java monitors | |
1882 // held by this thread must be released. A detach operation must only | |
1883 // get here if there are no Java frames on the stack. Therefore, any | |
1884 // owned monitors at this point MUST be JNI-acquired monitors which are | |
1885 // pre-inflated and in the monitor cache. | |
1886 // | |
1887 // ensure_join() ignores IllegalThreadStateExceptions, and so does this. | |
1888 if (exit_type == jni_detach && JNIDetachReleasesMonitors) { | |
1889 assert(!this->has_last_Java_frame(), "detaching with Java frames?"); | |
1890 ObjectSynchronizer::release_monitors_owned_by_thread(this); | |
1891 assert(!this->has_pending_exception(), "release_monitors should have cleared"); | |
1892 } | |
1893 | |
1894 // These things needs to be done while we are still a Java Thread. Make sure that thread | |
1895 // is in a consistent state, in case GC happens | |
1896 assert(_privileged_stack_top == NULL, "must be NULL when we get here"); | |
1897 | |
1898 if (active_handles() != NULL) { | |
1899 JNIHandleBlock* block = active_handles(); | |
1900 set_active_handles(NULL); | |
1901 JNIHandleBlock::release_block(block); | |
1902 } | |
1903 | |
1904 if (free_handle_block() != NULL) { | |
1905 JNIHandleBlock* block = free_handle_block(); | |
1906 set_free_handle_block(NULL); | |
1907 JNIHandleBlock::release_block(block); | |
1908 } | |
1909 | |
1910 // These have to be removed while this is still a valid thread. | |
1911 remove_stack_guard_pages(); | |
1912 | |
1913 if (UseTLAB) { | |
1914 tlab().make_parsable(true); // retire TLAB | |
1915 } | |
1916 | |
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1917 if (JvmtiEnv::environments_might_exist()) { |
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1918 JvmtiExport::cleanup_thread(this); |
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1919 } |
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1920 |
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1921 // We must flush any deferred card marks before removing a thread from |
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1922 // the list of active threads. |
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1923 Universe::heap()->flush_deferred_store_barrier(this); |
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1924 assert(deferred_card_mark().is_empty(), "Should have been flushed"); |
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1925 |
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1926 #if INCLUDE_ALL_GCS |
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1927 // We must flush the G1-related buffers before removing a thread |
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1928 // from the list of active threads. We must do this after any deferred |
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1929 // card marks have been flushed (above) so that any entries that are |
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1930 // added to the thread's dirty card queue as a result are not lost. |
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1931 if (UseG1GC) { |
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1932 flush_barrier_queues(); |
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1933 } |
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1934 #endif // INCLUDE_ALL_GCS |
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1935 |
0 | 1936 // Remove from list of active threads list, and notify VM thread if we are the last non-daemon thread |
1937 Threads::remove(this); | |
1938 } | |
1939 | |
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1940 #if INCLUDE_ALL_GCS |
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1941 // Flush G1-related queues. |
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1942 void JavaThread::flush_barrier_queues() { |
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1943 satb_mark_queue().flush(); |
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1944 dirty_card_queue().flush(); |
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1945 } |
1842
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1946 |
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1947 void JavaThread::initialize_queues() { |
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1948 assert(!SafepointSynchronize::is_at_safepoint(), |
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1949 "we should not be at a safepoint"); |
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1950 |
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1951 ObjPtrQueue& satb_queue = satb_mark_queue(); |
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1952 SATBMarkQueueSet& satb_queue_set = satb_mark_queue_set(); |
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1953 // The SATB queue should have been constructed with its active |
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1954 // field set to false. |
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1955 assert(!satb_queue.is_active(), "SATB queue should not be active"); |
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1956 assert(satb_queue.is_empty(), "SATB queue should be empty"); |
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1957 // If we are creating the thread during a marking cycle, we should |
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1958 // set the active field of the SATB queue to true. |
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1959 if (satb_queue_set.is_active()) { |
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1960 satb_queue.set_active(true); |
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1961 } |
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1962 |
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1963 DirtyCardQueue& dirty_queue = dirty_card_queue(); |
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1964 // The dirty card queue should have been constructed with its |
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1965 // active field set to true. |
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1966 assert(dirty_queue.is_active(), "dirty card queue should be active"); |
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1967 } |
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1968 #endif // INCLUDE_ALL_GCS |
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1969 |
0 | 1970 void JavaThread::cleanup_failed_attach_current_thread() { |
441
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1971 if (get_thread_profiler() != NULL) { |
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1972 get_thread_profiler()->disengage(); |
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1973 ResourceMark rm; |
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1974 get_thread_profiler()->print(get_thread_name()); |
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1975 } |
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1976 |
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1977 if (active_handles() != NULL) { |
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1978 JNIHandleBlock* block = active_handles(); |
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1979 set_active_handles(NULL); |
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1980 JNIHandleBlock::release_block(block); |
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1981 } |
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1982 |
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1983 if (free_handle_block() != NULL) { |
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1984 JNIHandleBlock* block = free_handle_block(); |
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1985 set_free_handle_block(NULL); |
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1986 JNIHandleBlock::release_block(block); |
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1987 } |
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1988 |
1290
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1989 // These have to be removed while this is still a valid thread. |
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1990 remove_stack_guard_pages(); |
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1991 |
441
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|
1992 if (UseTLAB) { |
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diff
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|
1993 tlab().make_parsable(true); // retire TLAB, if any |
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diff
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|
1994 } |
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diff
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|
1995 |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
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diff
changeset
|
1996 #if INCLUDE_ALL_GCS |
441
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diff
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|
1997 if (UseG1GC) { |
da9cb4e97a5f
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|
1998 flush_barrier_queues(); |
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diff
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|
1999 } |
8001
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jprovino
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diff
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|
2000 #endif // INCLUDE_ALL_GCS |
441
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diff
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|
2001 |
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iveresov
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diff
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|
2002 Threads::remove(this); |
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iveresov
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383
diff
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|
2003 delete this; |
0 | 2004 } |
2005 | |
2006 | |
441
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diff
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|
2007 |
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6770608: G1: Mutator thread can flush barrier and satb queues during safepoint
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diff
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|
2008 |
0 | 2009 JavaThread* JavaThread::active() { |
2010 Thread* thread = ThreadLocalStorage::thread(); | |
2011 assert(thread != NULL, "just checking"); | |
2012 if (thread->is_Java_thread()) { | |
2013 return (JavaThread*) thread; | |
2014 } else { | |
2015 assert(thread->is_VM_thread(), "this must be a vm thread"); | |
2016 VM_Operation* op = ((VMThread*) thread)->vm_operation(); | |
2017 JavaThread *ret=op == NULL ? NULL : (JavaThread *)op->calling_thread(); | |
2018 assert(ret->is_Java_thread(), "must be a Java thread"); | |
2019 return ret; | |
2020 } | |
2021 } | |
2022 | |
2023 bool JavaThread::is_lock_owned(address adr) const { | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
2024 if (Thread::is_lock_owned(adr)) return true; |
0 | 2025 |
2026 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2027 if (chunk->contains(adr)) return true; | |
2028 } | |
2029 | |
2030 return false; | |
2031 } | |
2032 | |
2033 | |
2034 void JavaThread::add_monitor_chunk(MonitorChunk* chunk) { | |
2035 chunk->set_next(monitor_chunks()); | |
2036 set_monitor_chunks(chunk); | |
2037 } | |
2038 | |
2039 void JavaThread::remove_monitor_chunk(MonitorChunk* chunk) { | |
2040 guarantee(monitor_chunks() != NULL, "must be non empty"); | |
2041 if (monitor_chunks() == chunk) { | |
2042 set_monitor_chunks(chunk->next()); | |
2043 } else { | |
2044 MonitorChunk* prev = monitor_chunks(); | |
2045 while (prev->next() != chunk) prev = prev->next(); | |
2046 prev->set_next(chunk->next()); | |
2047 } | |
2048 } | |
2049 | |
2050 // JVM support. | |
2051 | |
2052 // Note: this function shouldn't block if it's called in | |
2053 // _thread_in_native_trans state (such as from | |
2054 // check_special_condition_for_native_trans()). | |
2055 void JavaThread::check_and_handle_async_exceptions(bool check_unsafe_error) { | |
2056 | |
2057 if (has_last_Java_frame() && has_async_condition()) { | |
2058 // If we are at a polling page safepoint (not a poll return) | |
2059 // then we must defer async exception because live registers | |
2060 // will be clobbered by the exception path. Poll return is | |
2061 // ok because the call we a returning from already collides | |
2062 // with exception handling registers and so there is no issue. | |
2063 // (The exception handling path kills call result registers but | |
2064 // this is ok since the exception kills the result anyway). | |
2065 | |
2066 if (is_at_poll_safepoint()) { | |
2067 // if the code we are returning to has deoptimized we must defer | |
2068 // the exception otherwise live registers get clobbered on the | |
2069 // exception path before deoptimization is able to retrieve them. | |
2070 // | |
2071 RegisterMap map(this, false); | |
2072 frame caller_fr = last_frame().sender(&map); | |
2073 assert(caller_fr.is_compiled_frame(), "what?"); | |
2074 if (caller_fr.is_deoptimized_frame()) { | |
2075 if (TraceExceptions) { | |
2076 ResourceMark rm; | |
2077 tty->print_cr("deferred async exception at compiled safepoint"); | |
2078 } | |
2079 return; | |
2080 } | |
2081 } | |
2082 } | |
2083 | |
2084 JavaThread::AsyncRequests condition = clear_special_runtime_exit_condition(); | |
2085 if (condition == _no_async_condition) { | |
2086 // Conditions have changed since has_special_runtime_exit_condition() | |
2087 // was called: | |
2088 // - if we were here only because of an external suspend request, | |
2089 // then that was taken care of above (or cancelled) so we are done | |
2090 // - if we were here because of another async request, then it has | |
2091 // been cleared between the has_special_runtime_exit_condition() | |
2092 // and now so again we are done | |
2093 return; | |
2094 } | |
2095 | |
2096 // Check for pending async. exception | |
2097 if (_pending_async_exception != NULL) { | |
2098 // Only overwrite an already pending exception, if it is not a threadDeath. | |
1142 | 2099 if (!has_pending_exception() || !pending_exception()->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2100 |
2101 // We cannot call Exceptions::_throw(...) here because we cannot block | |
2102 set_pending_exception(_pending_async_exception, __FILE__, __LINE__); | |
2103 | |
2104 if (TraceExceptions) { | |
2105 ResourceMark rm; | |
2106 tty->print("Async. exception installed at runtime exit (" INTPTR_FORMAT ")", this); | |
2107 if (has_last_Java_frame() ) { | |
2108 frame f = last_frame(); | |
2109 tty->print(" (pc: " INTPTR_FORMAT " sp: " INTPTR_FORMAT " )", f.pc(), f.sp()); | |
2110 } | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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6198
diff
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|
2111 tty->print_cr(" of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2112 } |
2113 _pending_async_exception = NULL; | |
2114 clear_has_async_exception(); | |
2115 } | |
2116 } | |
2117 | |
2118 if (check_unsafe_error && | |
2119 condition == _async_unsafe_access_error && !has_pending_exception()) { | |
2120 condition = _no_async_condition; // done | |
2121 switch (thread_state()) { | |
2122 case _thread_in_vm: | |
2123 { | |
2124 JavaThread* THREAD = this; | |
2125 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2126 } | |
2127 case _thread_in_native: | |
2128 { | |
2129 ThreadInVMfromNative tiv(this); | |
2130 JavaThread* THREAD = this; | |
2131 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in an unsafe memory access operation"); | |
2132 } | |
2133 case _thread_in_Java: | |
2134 { | |
2135 ThreadInVMfromJava tiv(this); | |
2136 JavaThread* THREAD = this; | |
2137 THROW_MSG(vmSymbols::java_lang_InternalError(), "a fault occurred in a recent unsafe memory access operation in compiled Java code"); | |
2138 } | |
2139 default: | |
2140 ShouldNotReachHere(); | |
2141 } | |
2142 } | |
2143 | |
2144 assert(condition == _no_async_condition || has_pending_exception() || | |
2145 (!check_unsafe_error && condition == _async_unsafe_access_error), | |
2146 "must have handled the async condition, if no exception"); | |
2147 } | |
2148 | |
2149 void JavaThread::handle_special_runtime_exit_condition(bool check_asyncs) { | |
2150 // | |
2151 // Check for pending external suspend. Internal suspend requests do | |
2152 // not use handle_special_runtime_exit_condition(). | |
2153 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2154 // thread is not the current thread. In older versions of jdbx, jdbx | |
2155 // threads could call into the VM with another thread's JNIEnv so we | |
2156 // can be here operating on behalf of a suspended thread (4432884). | |
2157 bool do_self_suspend = is_external_suspend_with_lock(); | |
2158 if (do_self_suspend && (!AllowJNIEnvProxy || this == JavaThread::current())) { | |
2159 // | |
2160 // Because thread is external suspended the safepoint code will count | |
2161 // thread as at a safepoint. This can be odd because we can be here | |
2162 // as _thread_in_Java which would normally transition to _thread_blocked | |
2163 // at a safepoint. We would like to mark the thread as _thread_blocked | |
2164 // before calling java_suspend_self like all other callers of it but | |
2165 // we must then observe proper safepoint protocol. (We can't leave | |
2166 // _thread_blocked with a safepoint in progress). However we can be | |
2167 // here as _thread_in_native_trans so we can't use a normal transition | |
2168 // constructor/destructor pair because they assert on that type of | |
2169 // transition. We could do something like: | |
2170 // | |
2171 // JavaThreadState state = thread_state(); | |
2172 // set_thread_state(_thread_in_vm); | |
2173 // { | |
2174 // ThreadBlockInVM tbivm(this); | |
2175 // java_suspend_self() | |
2176 // } | |
2177 // set_thread_state(_thread_in_vm_trans); | |
2178 // if (safepoint) block; | |
2179 // set_thread_state(state); | |
2180 // | |
2181 // but that is pretty messy. Instead we just go with the way the | |
2182 // code has worked before and note that this is the only path to | |
2183 // java_suspend_self that doesn't put the thread in _thread_blocked | |
2184 // mode. | |
2185 | |
2186 frame_anchor()->make_walkable(this); | |
2187 java_suspend_self(); | |
2188 | |
2189 // We might be here for reasons in addition to the self-suspend request | |
2190 // so check for other async requests. | |
2191 } | |
2192 | |
2193 if (check_asyncs) { | |
2194 check_and_handle_async_exceptions(); | |
2195 } | |
2196 } | |
2197 | |
2198 void JavaThread::send_thread_stop(oop java_throwable) { | |
2199 assert(Thread::current()->is_VM_thread(), "should be in the vm thread"); | |
2200 assert(Threads_lock->is_locked(), "Threads_lock should be locked by safepoint code"); | |
2201 assert(SafepointSynchronize::is_at_safepoint(), "all threads are stopped"); | |
2202 | |
2203 // Do not throw asynchronous exceptions against the compiler thread | |
2204 // (the compiler thread should not be a Java thread -- fix in 1.4.2) | |
2205 if (is_Compiler_thread()) return; | |
2206 | |
2207 { | |
2208 // Actually throw the Throwable against the target Thread - however | |
2209 // only if there is no thread death exception installed already. | |
1142 | 2210 if (_pending_async_exception == NULL || !_pending_async_exception->is_a(SystemDictionary::ThreadDeath_klass())) { |
0 | 2211 // If the topmost frame is a runtime stub, then we are calling into |
2212 // OptoRuntime from compiled code. Some runtime stubs (new, monitor_exit..) | |
2213 // must deoptimize the caller before continuing, as the compiled exception handler table | |
2214 // may not be valid | |
2215 if (has_last_Java_frame()) { | |
2216 frame f = last_frame(); | |
2217 if (f.is_runtime_frame() || f.is_safepoint_blob_frame()) { | |
2218 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2219 RegisterMap reg_map(this, UseBiasedLocking); | |
2220 frame compiled_frame = f.sender(®_map); | |
7428
2d6c433b1f38
8004741: Missing compiled exception handle table entry for multidimensional array allocation
kvn
parents:
7206
diff
changeset
|
2221 if (!StressCompiledExceptionHandlers && compiled_frame.can_be_deoptimized()) { |
7483
729a79037bd5
Fixes after merge with hs25-b15.
Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
parents:
7482
diff
changeset
|
2222 Deoptimization::deoptimize(this, compiled_frame, ®_map, Deoptimization::Reason_constraint); |
0 | 2223 } |
2224 } | |
2225 } | |
2226 | |
2227 // Set async. pending exception in thread. | |
2228 set_pending_async_exception(java_throwable); | |
2229 | |
2230 if (TraceExceptions) { | |
2231 ResourceMark rm; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
2232 tty->print_cr("Pending Async. exception installed of type: %s", InstanceKlass::cast(_pending_async_exception->klass())->external_name()); |
0 | 2233 } |
2234 // for AbortVMOnException flag | |
6725
da91efe96a93
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coleenp
parents:
6198
diff
changeset
|
2235 NOT_PRODUCT(Exceptions::debug_check_abort(InstanceKlass::cast(_pending_async_exception->klass())->external_name())); |
0 | 2236 } |
2237 } | |
2238 | |
2239 | |
2240 // Interrupt thread so it will wake up from a potential wait() | |
2241 Thread::interrupt(this); | |
2242 } | |
2243 | |
2244 // External suspension mechanism. | |
2245 // | |
2246 // Tell the VM to suspend a thread when ever it knows that it does not hold on | |
2247 // to any VM_locks and it is at a transition | |
2248 // Self-suspension will happen on the transition out of the vm. | |
2249 // Catch "this" coming in from JNIEnv pointers when the thread has been freed | |
2250 // | |
2251 // Guarantees on return: | |
2252 // + Target thread will not execute any new bytecode (that's why we need to | |
2253 // force a safepoint) | |
2254 // + Target thread will not enter any new monitors | |
2255 // | |
2256 void JavaThread::java_suspend() { | |
2257 { MutexLocker mu(Threads_lock); | |
2258 if (!Threads::includes(this) || is_exiting() || this->threadObj() == NULL) { | |
2259 return; | |
2260 } | |
2261 } | |
2262 | |
2263 { MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2264 if (!is_external_suspend()) { | |
2265 // a racing resume has cancelled us; bail out now | |
2266 return; | |
2267 } | |
2268 | |
2269 // suspend is done | |
2270 uint32_t debug_bits = 0; | |
2271 // Warning: is_ext_suspend_completed() may temporarily drop the | |
2272 // SR_lock to allow the thread to reach a stable thread state if | |
2273 // it is currently in a transient thread state. | |
2274 if (is_ext_suspend_completed(false /* !called_by_wait */, | |
2275 SuspendRetryDelay, &debug_bits) ) { | |
2276 return; | |
2277 } | |
2278 } | |
2279 | |
2280 VM_ForceSafepoint vm_suspend; | |
2281 VMThread::execute(&vm_suspend); | |
2282 } | |
2283 | |
2284 // Part II of external suspension. | |
2285 // A JavaThread self suspends when it detects a pending external suspend | |
2286 // request. This is usually on transitions. It is also done in places | |
2287 // where continuing to the next transition would surprise the caller, | |
2288 // e.g., monitor entry. | |
2289 // | |
2290 // Returns the number of times that the thread self-suspended. | |
2291 // | |
2292 // Note: DO NOT call java_suspend_self() when you just want to block current | |
2293 // thread. java_suspend_self() is the second stage of cooperative | |
2294 // suspension for external suspend requests and should only be used | |
2295 // to complete an external suspend request. | |
2296 // | |
2297 int JavaThread::java_suspend_self() { | |
2298 int ret = 0; | |
2299 | |
2300 // we are in the process of exiting so don't suspend | |
2301 if (is_exiting()) { | |
2302 clear_external_suspend(); | |
2303 return ret; | |
2304 } | |
2305 | |
2306 assert(_anchor.walkable() || | |
2307 (is_Java_thread() && !((JavaThread*)this)->has_last_Java_frame()), | |
2308 "must have walkable stack"); | |
2309 | |
2310 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2311 | |
979 | 2312 assert(!this->is_ext_suspended(), |
0 | 2313 "a thread trying to self-suspend should not already be suspended"); |
2314 | |
2315 if (this->is_suspend_equivalent()) { | |
2316 // If we are self-suspending as a result of the lifting of a | |
2317 // suspend equivalent condition, then the suspend_equivalent | |
2318 // flag is not cleared until we set the ext_suspended flag so | |
2319 // that wait_for_ext_suspend_completion() returns consistent | |
2320 // results. | |
2321 this->clear_suspend_equivalent(); | |
2322 } | |
2323 | |
2324 // A racing resume may have cancelled us before we grabbed SR_lock | |
2325 // above. Or another external suspend request could be waiting for us | |
2326 // by the time we return from SR_lock()->wait(). The thread | |
2327 // that requested the suspension may already be trying to walk our | |
2328 // stack and if we return now, we can change the stack out from under | |
2329 // it. This would be a "bad thing (TM)" and cause the stack walker | |
2330 // to crash. We stay self-suspended until there are no more pending | |
2331 // external suspend requests. | |
2332 while (is_external_suspend()) { | |
2333 ret++; | |
2334 this->set_ext_suspended(); | |
2335 | |
2336 // _ext_suspended flag is cleared by java_resume() | |
2337 while (is_ext_suspended()) { | |
2338 this->SR_lock()->wait(Mutex::_no_safepoint_check_flag); | |
2339 } | |
2340 } | |
2341 | |
2342 return ret; | |
2343 } | |
2344 | |
2345 #ifdef ASSERT | |
2346 // verify the JavaThread has not yet been published in the Threads::list, and | |
2347 // hence doesn't need protection from concurrent access at this stage | |
2348 void JavaThread::verify_not_published() { | |
2349 if (!Threads_lock->owned_by_self()) { | |
2350 MutexLockerEx ml(Threads_lock, Mutex::_no_safepoint_check_flag); | |
2351 assert( !Threads::includes(this), | |
2352 "java thread shouldn't have been published yet!"); | |
2353 } | |
2354 else { | |
2355 assert( !Threads::includes(this), | |
2356 "java thread shouldn't have been published yet!"); | |
2357 } | |
2358 } | |
2359 #endif | |
2360 | |
2361 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2362 // progress or when _suspend_flags is non-zero. | |
2363 // Current thread needs to self-suspend if there is a suspend request and/or | |
2364 // block if a safepoint is in progress. | |
2365 // Async exception ISN'T checked. | |
2366 // Note only the ThreadInVMfromNative transition can call this function | |
2367 // directly and when thread state is _thread_in_native_trans | |
2368 void JavaThread::check_safepoint_and_suspend_for_native_trans(JavaThread *thread) { | |
2369 assert(thread->thread_state() == _thread_in_native_trans, "wrong state"); | |
2370 | |
2371 JavaThread *curJT = JavaThread::current(); | |
2372 bool do_self_suspend = thread->is_external_suspend(); | |
2373 | |
2374 assert(!curJT->has_last_Java_frame() || curJT->frame_anchor()->walkable(), "Unwalkable stack in native->vm transition"); | |
2375 | |
2376 // If JNIEnv proxies are allowed, don't self-suspend if the target | |
2377 // thread is not the current thread. In older versions of jdbx, jdbx | |
2378 // threads could call into the VM with another thread's JNIEnv so we | |
2379 // can be here operating on behalf of a suspended thread (4432884). | |
2380 if (do_self_suspend && (!AllowJNIEnvProxy || curJT == thread)) { | |
2381 JavaThreadState state = thread->thread_state(); | |
2382 | |
2383 // We mark this thread_blocked state as a suspend-equivalent so | |
2384 // that a caller to is_ext_suspend_completed() won't be confused. | |
2385 // The suspend-equivalent state is cleared by java_suspend_self(). | |
2386 thread->set_suspend_equivalent(); | |
2387 | |
2388 // If the safepoint code sees the _thread_in_native_trans state, it will | |
2389 // wait until the thread changes to other thread state. There is no | |
2390 // guarantee on how soon we can obtain the SR_lock and complete the | |
2391 // self-suspend request. It would be a bad idea to let safepoint wait for | |
2392 // too long. Temporarily change the state to _thread_blocked to | |
2393 // let the VM thread know that this thread is ready for GC. The problem | |
2394 // of changing thread state is that safepoint could happen just after | |
2395 // java_suspend_self() returns after being resumed, and VM thread will | |
2396 // see the _thread_blocked state. We must check for safepoint | |
2397 // after restoring the state and make sure we won't leave while a safepoint | |
2398 // is in progress. | |
2399 thread->set_thread_state(_thread_blocked); | |
2400 thread->java_suspend_self(); | |
2401 thread->set_thread_state(state); | |
2402 // Make sure new state is seen by VM thread | |
2403 if (os::is_MP()) { | |
2404 if (UseMembar) { | |
2405 // Force a fence between the write above and read below | |
2406 OrderAccess::fence(); | |
2407 } else { | |
2408 // Must use this rather than serialization page in particular on Windows | |
2409 InterfaceSupport::serialize_memory(thread); | |
2410 } | |
2411 } | |
2412 } | |
2413 | |
2414 if (SafepointSynchronize::do_call_back()) { | |
2415 // If we are safepointing, then block the caller which may not be | |
2416 // the same as the target thread (see above). | |
2417 SafepointSynchronize::block(curJT); | |
2418 } | |
2419 | |
2420 if (thread->is_deopt_suspend()) { | |
2421 thread->clear_deopt_suspend(); | |
2422 RegisterMap map(thread, false); | |
2423 frame f = thread->last_frame(); | |
2424 while ( f.id() != thread->must_deopt_id() && ! f.is_first_frame()) { | |
2425 f = f.sender(&map); | |
2426 } | |
2427 if (f.id() == thread->must_deopt_id()) { | |
2428 thread->clear_must_deopt_id(); | |
1727
da877bdc9000
6975006: assert(check.is_deoptimized_frame()) failed: missed deopt
never
parents:
1689
diff
changeset
|
2429 f.deoptimize(thread); |
0 | 2430 } else { |
2431 fatal("missed deoptimization!"); | |
2432 } | |
2433 } | |
2434 } | |
2435 | |
2436 // Slow path when the native==>VM/Java barriers detect a safepoint is in | |
2437 // progress or when _suspend_flags is non-zero. | |
2438 // Current thread needs to self-suspend if there is a suspend request and/or | |
2439 // block if a safepoint is in progress. | |
2440 // Also check for pending async exception (not including unsafe access error). | |
2441 // Note only the native==>VM/Java barriers can call this function and when | |
2442 // thread state is _thread_in_native_trans. | |
2443 void JavaThread::check_special_condition_for_native_trans(JavaThread *thread) { | |
2444 check_safepoint_and_suspend_for_native_trans(thread); | |
2445 | |
2446 if (thread->has_async_exception()) { | |
2447 // We are in _thread_in_native_trans state, don't handle unsafe | |
2448 // access error since that may block. | |
2449 thread->check_and_handle_async_exceptions(false); | |
2450 } | |
2451 } | |
2452 | |
4873
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2453 // This is a variant of the normal |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2454 // check_special_condition_for_native_trans with slightly different |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2455 // semantics for use by critical native wrappers. It does all the |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2456 // normal checks but also performs the transition back into |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2457 // thread_in_Java state. This is required so that critical natives |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2458 // can potentially block and perform a GC if they are the last thread |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2459 // exiting the GC_locker. |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2460 void JavaThread::check_special_condition_for_native_trans_and_transition(JavaThread *thread) { |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2461 check_special_condition_for_native_trans(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2462 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
changeset
|
2463 // Finish the transition |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2464 thread->set_thread_state(_thread_in_Java); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2465 |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
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parents:
4872
diff
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|
2466 if (thread->do_critical_native_unlock()) { |
0382d2b469b2
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parents:
4872
diff
changeset
|
2467 ThreadInVMfromJavaNoAsyncException tiv(thread); |
0382d2b469b2
7013347: allow crypto functions to be called inline to enhance performance
never
parents:
4872
diff
changeset
|
2468 GC_locker::unlock_critical(thread); |
0382d2b469b2
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parents:
4872
diff
changeset
|
2469 thread->clear_critical_native_unlock(); |
0382d2b469b2
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parents:
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diff
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|
2470 } |
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parents:
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diff
changeset
|
2471 } |
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diff
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|
2472 |
0 | 2473 // We need to guarantee the Threads_lock here, since resumes are not |
2474 // allowed during safepoint synchronization | |
2475 // Can only resume from an external suspension | |
2476 void JavaThread::java_resume() { | |
2477 assert_locked_or_safepoint(Threads_lock); | |
2478 | |
2479 // Sanity check: thread is gone, has started exiting or the thread | |
2480 // was not externally suspended. | |
2481 if (!Threads::includes(this) || is_exiting() || !is_external_suspend()) { | |
2482 return; | |
2483 } | |
2484 | |
2485 MutexLockerEx ml(SR_lock(), Mutex::_no_safepoint_check_flag); | |
2486 | |
2487 clear_external_suspend(); | |
2488 | |
2489 if (is_ext_suspended()) { | |
2490 clear_ext_suspended(); | |
2491 SR_lock()->notify_all(); | |
2492 } | |
2493 } | |
2494 | |
2495 void JavaThread::create_stack_guard_pages() { | |
2496 if (! os::uses_stack_guard_pages() || _stack_guard_state != stack_guard_unused) return; | |
2497 address low_addr = stack_base() - stack_size(); | |
2498 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2499 | |
2500 int allocate = os::allocate_stack_guard_pages(); | |
2501 // warning("Guarding at " PTR_FORMAT " for len " SIZE_FORMAT "\n", low_addr, len); | |
2502 | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2503 if (allocate && !os::create_stack_guard_pages((char *) low_addr, len)) { |
0 | 2504 warning("Attempt to allocate stack guard pages failed."); |
2505 return; | |
2506 } | |
2507 | |
2508 if (os::guard_memory((char *) low_addr, len)) { | |
2509 _stack_guard_state = stack_guard_enabled; | |
2510 } else { | |
2511 warning("Attempt to protect stack guard pages failed."); | |
2512 if (os::uncommit_memory((char *) low_addr, len)) { | |
2513 warning("Attempt to deallocate stack guard pages failed."); | |
2514 } | |
2515 } | |
2516 } | |
2517 | |
2518 void JavaThread::remove_stack_guard_pages() { | |
6882
716c64bda5ba
7199092: NMT: NMT needs to deal overlapped virtual memory ranges
zgu
parents:
6872
diff
changeset
|
2519 assert(Thread::current() == this, "from different thread"); |
0 | 2520 if (_stack_guard_state == stack_guard_unused) return; |
2521 address low_addr = stack_base() - stack_size(); | |
2522 size_t len = (StackYellowPages + StackRedPages) * os::vm_page_size(); | |
2523 | |
2524 if (os::allocate_stack_guard_pages()) { | |
1320
3b3d12e645e7
6929067: Stack guard pages should be removed when thread is detached
coleenp
parents:
1290
diff
changeset
|
2525 if (os::remove_stack_guard_pages((char *) low_addr, len)) { |
0 | 2526 _stack_guard_state = stack_guard_unused; |
2527 } else { | |
2528 warning("Attempt to deallocate stack guard pages failed."); | |
2529 } | |
2530 } else { | |
2531 if (_stack_guard_state == stack_guard_unused) return; | |
2532 if (os::unguard_memory((char *) low_addr, len)) { | |
2533 _stack_guard_state = stack_guard_unused; | |
2534 } else { | |
2535 warning("Attempt to unprotect stack guard pages failed."); | |
2536 } | |
2537 } | |
2538 } | |
2539 | |
2540 void JavaThread::enable_stack_yellow_zone() { | |
2541 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2542 assert(_stack_guard_state != stack_guard_enabled, "already enabled"); | |
2543 | |
2544 // The base notation is from the stacks point of view, growing downward. | |
2545 // We need to adjust it to work correctly with guard_memory() | |
2546 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2547 | |
2548 guarantee(base < stack_base(),"Error calculating stack yellow zone"); | |
2549 guarantee(base < os::current_stack_pointer(),"Error calculating stack yellow zone"); | |
2550 | |
2551 if (os::guard_memory((char *) base, stack_yellow_zone_size())) { | |
2552 _stack_guard_state = stack_guard_enabled; | |
2553 } else { | |
2554 warning("Attempt to guard stack yellow zone failed."); | |
2555 } | |
2556 enable_register_stack_guard(); | |
2557 } | |
2558 | |
2559 void JavaThread::disable_stack_yellow_zone() { | |
2560 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2561 assert(_stack_guard_state != stack_guard_yellow_disabled, "already disabled"); | |
2562 | |
2563 // Simply return if called for a thread that does not use guard pages. | |
2564 if (_stack_guard_state == stack_guard_unused) return; | |
2565 | |
2566 // The base notation is from the stacks point of view, growing downward. | |
2567 // We need to adjust it to work correctly with guard_memory() | |
2568 address base = stack_yellow_zone_base() - stack_yellow_zone_size(); | |
2569 | |
2570 if (os::unguard_memory((char *)base, stack_yellow_zone_size())) { | |
2571 _stack_guard_state = stack_guard_yellow_disabled; | |
2572 } else { | |
2573 warning("Attempt to unguard stack yellow zone failed."); | |
2574 } | |
2575 disable_register_stack_guard(); | |
2576 } | |
2577 | |
2578 void JavaThread::enable_stack_red_zone() { | |
2579 // The base notation is from the stacks point of view, growing downward. | |
2580 // We need to adjust it to work correctly with guard_memory() | |
2581 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2582 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2583 | |
2584 guarantee(base < stack_base(),"Error calculating stack red zone"); | |
2585 guarantee(base < os::current_stack_pointer(),"Error calculating stack red zone"); | |
2586 | |
2587 if(!os::guard_memory((char *) base, stack_red_zone_size())) { | |
2588 warning("Attempt to guard stack red zone failed."); | |
2589 } | |
2590 } | |
2591 | |
2592 void JavaThread::disable_stack_red_zone() { | |
2593 // The base notation is from the stacks point of view, growing downward. | |
2594 // We need to adjust it to work correctly with guard_memory() | |
2595 assert(_stack_guard_state != stack_guard_unused, "must be using guard pages."); | |
2596 address base = stack_red_zone_base() - stack_red_zone_size(); | |
2597 if (!os::unguard_memory((char *)base, stack_red_zone_size())) { | |
2598 warning("Attempt to unguard stack red zone failed."); | |
2599 } | |
2600 } | |
2601 | |
2602 void JavaThread::frames_do(void f(frame*, const RegisterMap* map)) { | |
2603 // ignore is there is no stack | |
2604 if (!has_last_Java_frame()) return; | |
2605 // traverse the stack frames. Starts from top frame. | |
2606 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2607 frame* fr = fst.current(); | |
2608 f(fr, fst.register_map()); | |
2609 } | |
2610 } | |
2611 | |
2612 | |
2613 #ifndef PRODUCT | |
2614 // Deoptimization | |
2615 // Function for testing deoptimization | |
2616 void JavaThread::deoptimize() { | |
2617 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2618 StackFrameStream fst(this, UseBiasedLocking); | |
2619 bool deopt = false; // Dump stack only if a deopt actually happens. | |
2620 bool only_at = strlen(DeoptimizeOnlyAt) > 0; | |
2621 // Iterate over all frames in the thread and deoptimize | |
2622 for(; !fst.is_done(); fst.next()) { | |
2623 if(fst.current()->can_be_deoptimized()) { | |
2624 | |
2625 if (only_at) { | |
2626 // Deoptimize only at particular bcis. DeoptimizeOnlyAt | |
2627 // consists of comma or carriage return separated numbers so | |
2628 // search for the current bci in that string. | |
2629 address pc = fst.current()->pc(); | |
2630 nmethod* nm = (nmethod*) fst.current()->cb(); | |
2631 ScopeDesc* sd = nm->scope_desc_at( pc); | |
2632 char buffer[8]; | |
2633 jio_snprintf(buffer, sizeof(buffer), "%d", sd->bci()); | |
2634 size_t len = strlen(buffer); | |
2635 const char * found = strstr(DeoptimizeOnlyAt, buffer); | |
2636 while (found != NULL) { | |
2637 if ((found[len] == ',' || found[len] == '\n' || found[len] == '\0') && | |
2638 (found == DeoptimizeOnlyAt || found[-1] == ',' || found[-1] == '\n')) { | |
2639 // Check that the bci found is bracketed by terminators. | |
2640 break; | |
2641 } | |
2642 found = strstr(found + 1, buffer); | |
2643 } | |
2644 if (!found) { | |
2645 continue; | |
2646 } | |
2647 } | |
2648 | |
2649 if (DebugDeoptimization && !deopt) { | |
2650 deopt = true; // One-time only print before deopt | |
2651 tty->print_cr("[BEFORE Deoptimization]"); | |
2652 trace_frames(); | |
2653 trace_stack(); | |
2654 } | |
5111
422c979ff392
fixed two cases where DeoptAction was invalid
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5110
diff
changeset
|
2655 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2656 } |
2657 } | |
2658 | |
2659 if (DebugDeoptimization && deopt) { | |
2660 tty->print_cr("[AFTER Deoptimization]"); | |
2661 trace_frames(); | |
2662 } | |
2663 } | |
2664 | |
2665 | |
2666 // Make zombies | |
2667 void JavaThread::make_zombies() { | |
2668 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
2669 if (fst.current()->can_be_deoptimized()) { | |
2670 // it is a Java nmethod | |
2671 nmethod* nm = CodeCache::find_nmethod(fst.current()->pc()); | |
2672 nm->make_not_entrant(); | |
2673 } | |
2674 } | |
2675 } | |
2676 #endif // PRODUCT | |
2677 | |
2678 | |
2679 void JavaThread::deoptimized_wrt_marked_nmethods() { | |
2680 if (!has_last_Java_frame()) return; | |
2681 // BiasedLocking needs an updated RegisterMap for the revoke monitors pass | |
2682 StackFrameStream fst(this, UseBiasedLocking); | |
2683 for(; !fst.is_done(); fst.next()) { | |
2684 if (fst.current()->should_be_deoptimized()) { | |
6843 | 2685 if (LogCompilation && xtty != NULL) { |
2686 nmethod* nm = fst.current()->cb()->as_nmethod_or_null(); | |
2687 xtty->elem("deoptimized thread='" UINTX_FORMAT "' compile_id='%d'", | |
2688 this->name(), nm != NULL ? nm->compile_id() : -1); | |
2689 } | |
2690 | |
5110
0ebca2e35ca5
more preparations for disabling runtime feedback selectively based on deoptimization history
Christian Haeubl <christian.haeubl@oracle.com>
parents:
5056
diff
changeset
|
2691 Deoptimization::deoptimize(this, *fst.current(), fst.register_map(), Deoptimization::Reason_constraint); |
0 | 2692 } |
2693 } | |
2694 } | |
2695 | |
2696 | |
2697 // GC support | |
2698 static void frame_gc_epilogue(frame* f, const RegisterMap* map) { f->gc_epilogue(); } | |
2699 | |
2700 void JavaThread::gc_epilogue() { | |
2701 frames_do(frame_gc_epilogue); | |
2702 } | |
2703 | |
2704 | |
2705 static void frame_gc_prologue(frame* f, const RegisterMap* map) { f->gc_prologue(); } | |
2706 | |
2707 void JavaThread::gc_prologue() { | |
2708 frames_do(frame_gc_prologue); | |
2709 } | |
2710 | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2711 // If the caller is a NamedThread, then remember, in the current scope, |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2712 // the given JavaThread in its _processed_thread field. |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2713 class RememberProcessedThread: public StackObj { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2714 NamedThread* _cur_thr; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2715 public: |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2716 RememberProcessedThread(JavaThread* jthr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2717 Thread* thread = Thread::current(); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2718 if (thread->is_Named_thread()) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2719 _cur_thr = (NamedThread *)thread; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2720 _cur_thr->set_processed_thread(jthr); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2721 } else { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2722 _cur_thr = NULL; |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2723 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2724 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2725 |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2726 ~RememberProcessedThread() { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2727 if (_cur_thr) { |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2728 _cur_thr->set_processed_thread(NULL); |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2729 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2730 } |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2731 }; |
0 | 2732 |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2733 void JavaThread::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
1166 | 2734 // Verify that the deferred card marks have been flushed. |
2735 assert(deferred_card_mark().is_empty(), "Should be empty during GC"); | |
1027
39b01ab7035a
6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning
ysr
parents:
997
diff
changeset
|
2736 |
0 | 2737 // The ThreadProfiler oops_do is done from FlatProfiler::oops_do |
2738 // since there may be more than one thread using each ThreadProfiler. | |
2739 | |
2740 // Traverse the GCHandles | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2741 Thread::oops_do(f, cld_f, cf); |
0 | 2742 |
2743 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2744 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2745 | |
2746 if (has_last_Java_frame()) { | |
1119
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2747 // Record JavaThread to GC thread |
547f81740344
6361589: Print out stack trace for target thread of GC crash
minqi
parents:
1115
diff
changeset
|
2748 RememberProcessedThread rpt(this); |
0 | 2749 |
2750 // Traverse the privileged stack | |
2751 if (_privileged_stack_top != NULL) { | |
2752 _privileged_stack_top->oops_do(f); | |
2753 } | |
2754 | |
2755 // traverse the registered growable array | |
2756 if (_array_for_gc != NULL) { | |
2757 for (int index = 0; index < _array_for_gc->length(); index++) { | |
2758 f->do_oop(_array_for_gc->adr_at(index)); | |
2759 } | |
2760 } | |
2761 | |
2762 // Traverse the monitor chunks | |
2763 for (MonitorChunk* chunk = monitor_chunks(); chunk != NULL; chunk = chunk->next()) { | |
2764 chunk->oops_do(f); | |
2765 } | |
2766 | |
2767 // Traverse the execution stack | |
2768 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
2769 fst.current()->oops_do(f, cld_f, cf, fst.register_map()); |
0 | 2770 } |
2771 } | |
2772 | |
2773 // callee_target is never live across a gc point so NULL it here should | |
2774 // it still contain a methdOop. | |
2775 | |
2776 set_callee_target(NULL); | |
2777 | |
2778 assert(vframe_array_head() == NULL, "deopt in progress at a safepoint!"); | |
2779 // If we have deferred set_locals there might be oops waiting to be | |
2780 // written | |
2781 GrowableArray<jvmtiDeferredLocalVariableSet*>* list = deferred_locals(); | |
2782 if (list != NULL) { | |
2783 for (int i = 0; i < list->length(); i++) { | |
2784 list->at(i)->oops_do(f); | |
2785 } | |
2786 } | |
2787 | |
2788 // Traverse instance variables at the end since the GC may be moving things | |
2789 // around using this function | |
2790 f->do_oop((oop*) &_threadObj); | |
2791 f->do_oop((oop*) &_vm_result); | |
2792 f->do_oop((oop*) &_exception_oop); | |
2793 f->do_oop((oop*) &_pending_async_exception); | |
2794 | |
2795 if (jvmti_thread_state() != NULL) { | |
2796 jvmti_thread_state()->oops_do(f); | |
2797 } | |
3696
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2798 |
dc7902820c9b
Make NMethodSweeper work on any JavaThread
Gilles Duboscq <gilles.m.duboscq@gmail.com>
parents:
3650
diff
changeset
|
2799 if (_scanned_nmethod != NULL && cf != NULL) { |
7212
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2800 // Safepoints can occur when the sweeper is scanning an nmethod so |
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
2801 // process it here to make sure it isn't unloaded in the middle of |
291ffc492eb6
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Doug Simon <doug.simon@oracle.com>
diff
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|
2802 // a scan. |
291ffc492eb6
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Doug Simon <doug.simon@oracle.com>
diff
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|
2803 cf->do_code_blob(_scanned_nmethod); |
291ffc492eb6
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Doug Simon <doug.simon@oracle.com>
diff
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|
2804 } |
0 | 2805 } |
2806 | |
989
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2807 void JavaThread::nmethods_do(CodeBlobClosure* cf) { |
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2808 Thread::nmethods_do(cf); // (super method is a no-op) |
0 | 2809 |
2810 assert( (!has_last_Java_frame() && java_call_counter() == 0) || | |
2811 (has_last_Java_frame() && java_call_counter() > 0), "wrong java_sp info!"); | |
2812 | |
2813 if (has_last_Java_frame()) { | |
2814 // Traverse the execution stack | |
2815 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
989
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|
2816 fst.current()->nmethods_do(cf); |
0 | 2817 } |
2818 } | |
2819 } | |
2820 | |
6725
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2821 void JavaThread::metadata_do(void f(Metadata*)) { |
da91efe96a93
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2822 Thread::metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
2823 if (has_last_Java_frame()) { |
da91efe96a93
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|
2824 // Traverse the execution stack to call f() on the methods in the stack |
da91efe96a93
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2825 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { |
da91efe96a93
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coleenp
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2826 fst.current()->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
2827 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
2828 } else if (is_Compiler_thread()) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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changeset
|
2829 // need to walk ciMetadata in current compile tasks to keep alive. |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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2830 CompilerThread* ct = (CompilerThread*)this; |
da91efe96a93
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coleenp
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|
2831 if (ct->env() != NULL) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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|
2832 ct->env()->metadata_do(f); |
da91efe96a93
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|
2833 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
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|
2834 } |
da91efe96a93
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|
2835 } |
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2836 |
0 | 2837 // Printing |
2838 const char* _get_thread_state_name(JavaThreadState _thread_state) { | |
2839 switch (_thread_state) { | |
2840 case _thread_uninitialized: return "_thread_uninitialized"; | |
2841 case _thread_new: return "_thread_new"; | |
2842 case _thread_new_trans: return "_thread_new_trans"; | |
2843 case _thread_in_native: return "_thread_in_native"; | |
2844 case _thread_in_native_trans: return "_thread_in_native_trans"; | |
2845 case _thread_in_vm: return "_thread_in_vm"; | |
2846 case _thread_in_vm_trans: return "_thread_in_vm_trans"; | |
2847 case _thread_in_Java: return "_thread_in_Java"; | |
2848 case _thread_in_Java_trans: return "_thread_in_Java_trans"; | |
2849 case _thread_blocked: return "_thread_blocked"; | |
2850 case _thread_blocked_trans: return "_thread_blocked_trans"; | |
2851 default: return "unknown thread state"; | |
2852 } | |
2853 } | |
2854 | |
2855 #ifndef PRODUCT | |
2856 void JavaThread::print_thread_state_on(outputStream *st) const { | |
2857 st->print_cr(" JavaThread state: %s", _get_thread_state_name(_thread_state)); | |
2858 }; | |
2859 void JavaThread::print_thread_state() const { | |
2860 print_thread_state_on(tty); | |
2861 }; | |
2862 #endif // PRODUCT | |
2863 | |
2864 // Called by Threads::print() for VM_PrintThreads operation | |
2865 void JavaThread::print_on(outputStream *st) const { | |
2866 st->print("\"%s\" ", get_thread_name()); | |
2867 oop thread_oop = threadObj(); | |
6766 | 2868 if (thread_oop != NULL) { |
2869 st->print("#" INT64_FORMAT " ", java_lang_Thread::thread_id(thread_oop)); | |
2870 if (java_lang_Thread::is_daemon(thread_oop)) st->print("daemon "); | |
2871 st->print("prio=%d ", java_lang_Thread::priority(thread_oop)); | |
2872 } | |
0 | 2873 Thread::print_on(st); |
2874 // print guess for valid stack memory region (assume 4K pages); helps lock debugging | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
2875 st->print_cr("[" INTPTR_FORMAT "]", (intptr_t)last_Java_sp() & ~right_n_bits(12)); |
0 | 2876 if (thread_oop != NULL && JDK_Version::is_gte_jdk15x_version()) { |
2877 st->print_cr(" java.lang.Thread.State: %s", java_lang_Thread::thread_status_name(thread_oop)); | |
2878 } | |
2879 #ifndef PRODUCT | |
2880 print_thread_state_on(st); | |
2881 _safepoint_state->print_on(st); | |
2882 #endif // PRODUCT | |
2883 } | |
2884 | |
2885 // Called by fatal error handler. The difference between this and | |
2886 // JavaThread::print() is that we can't grab lock or allocate memory. | |
2887 void JavaThread::print_on_error(outputStream* st, char *buf, int buflen) const { | |
2888 st->print("JavaThread \"%s\"", get_thread_name_string(buf, buflen)); | |
2889 oop thread_obj = threadObj(); | |
2890 if (thread_obj != NULL) { | |
2891 if (java_lang_Thread::is_daemon(thread_obj)) st->print(" daemon"); | |
2892 } | |
2893 st->print(" ["); | |
2894 st->print("%s", _get_thread_state_name(_thread_state)); | |
2895 if (osthread()) { | |
2896 st->print(", id=%d", osthread()->thread_id()); | |
2897 } | |
2898 st->print(", stack(" PTR_FORMAT "," PTR_FORMAT ")", | |
2899 _stack_base - _stack_size, _stack_base); | |
2900 st->print("]"); | |
2901 return; | |
2902 } | |
2903 | |
2904 // Verification | |
2905 | |
2906 static void frame_verify(frame* f, const RegisterMap *map) { f->verify(map); } | |
2907 | |
2908 void JavaThread::verify() { | |
2909 // Verify oops in the thread. | |
7179
d0aa87f04bd5
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stefank
parents:
7177
diff
changeset
|
2910 oops_do(&VerifyOopClosure::verify_oop, NULL, NULL); |
0 | 2911 |
2912 // Verify the stack frames. | |
2913 frames_do(frame_verify); | |
2914 } | |
2915 | |
2916 // CR 6300358 (sub-CR 2137150) | |
2917 // Most callers of this method assume that it can't return NULL but a | |
2918 // thread may not have a name whilst it is in the process of attaching to | |
2919 // the VM - see CR 6412693, and there are places where a JavaThread can be | |
2920 // seen prior to having it's threadObj set (eg JNI attaching threads and | |
2921 // if vm exit occurs during initialization). These cases can all be accounted | |
2922 // for such that this method never returns NULL. | |
2923 const char* JavaThread::get_thread_name() const { | |
2924 #ifdef ASSERT | |
2925 // early safepoints can hit while current thread does not yet have TLS | |
2926 if (!SafepointSynchronize::is_at_safepoint()) { | |
2927 Thread *cur = Thread::current(); | |
2928 if (!(cur->is_Java_thread() && cur == this)) { | |
2929 // Current JavaThreads are allowed to get their own name without | |
2930 // the Threads_lock. | |
2931 assert_locked_or_safepoint(Threads_lock); | |
2932 } | |
2933 } | |
2934 #endif // ASSERT | |
2935 return get_thread_name_string(); | |
2936 } | |
2937 | |
2938 // Returns a non-NULL representation of this thread's name, or a suitable | |
2939 // descriptive string if there is no set name | |
2940 const char* JavaThread::get_thread_name_string(char* buf, int buflen) const { | |
2941 const char* name_str; | |
2942 oop thread_obj = threadObj(); | |
2943 if (thread_obj != NULL) { | |
2944 typeArrayOop name = java_lang_Thread::name(thread_obj); | |
2945 if (name != NULL) { | |
2946 if (buf == NULL) { | |
2947 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2948 } | |
2949 else { | |
2950 name_str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length(), buf, buflen); | |
2951 } | |
2952 } | |
4006 | 2953 else if (is_attaching_via_jni()) { // workaround for 6412693 - see 6404306 |
0 | 2954 name_str = "<no-name - thread is attaching>"; |
2955 } | |
2956 else { | |
2957 name_str = Thread::name(); | |
2958 } | |
2959 } | |
2960 else { | |
2961 name_str = Thread::name(); | |
2962 } | |
2963 assert(name_str != NULL, "unexpected NULL thread name"); | |
2964 return name_str; | |
2965 } | |
2966 | |
2967 | |
2968 const char* JavaThread::get_threadgroup_name() const { | |
2969 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2970 oop thread_obj = threadObj(); | |
2971 if (thread_obj != NULL) { | |
2972 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2973 if (thread_group != NULL) { | |
2974 typeArrayOop name = java_lang_ThreadGroup::name(thread_group); | |
2975 // ThreadGroup.name can be null | |
2976 if (name != NULL) { | |
2977 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2978 return str; | |
2979 } | |
2980 } | |
2981 } | |
2982 return NULL; | |
2983 } | |
2984 | |
2985 const char* JavaThread::get_parent_name() const { | |
2986 debug_only(if (JavaThread::current() != this) assert_locked_or_safepoint(Threads_lock);) | |
2987 oop thread_obj = threadObj(); | |
2988 if (thread_obj != NULL) { | |
2989 oop thread_group = java_lang_Thread::threadGroup(thread_obj); | |
2990 if (thread_group != NULL) { | |
2991 oop parent = java_lang_ThreadGroup::parent(thread_group); | |
2992 if (parent != NULL) { | |
2993 typeArrayOop name = java_lang_ThreadGroup::name(parent); | |
2994 // ThreadGroup.name can be null | |
2995 if (name != NULL) { | |
2996 const char* str = UNICODE::as_utf8((jchar*) name->base(T_CHAR), name->length()); | |
2997 return str; | |
2998 } | |
2999 } | |
3000 } | |
3001 } | |
3002 return NULL; | |
3003 } | |
3004 | |
3005 ThreadPriority JavaThread::java_priority() const { | |
3006 oop thr_oop = threadObj(); | |
3007 if (thr_oop == NULL) return NormPriority; // Bootstrapping | |
3008 ThreadPriority priority = java_lang_Thread::priority(thr_oop); | |
3009 assert(MinPriority <= priority && priority <= MaxPriority, "sanity check"); | |
3010 return priority; | |
3011 } | |
3012 | |
3013 void JavaThread::prepare(jobject jni_thread, ThreadPriority prio) { | |
3014 | |
3015 assert(Threads_lock->owner() == Thread::current(), "must have threads lock"); | |
3016 // Link Java Thread object <-> C++ Thread | |
3017 | |
3018 // Get the C++ thread object (an oop) from the JNI handle (a jthread) | |
3019 // and put it into a new Handle. The Handle "thread_oop" can then | |
3020 // be used to pass the C++ thread object to other methods. | |
3021 | |
3022 // Set the Java level thread object (jthread) field of the | |
3023 // new thread (a JavaThread *) to C++ thread object using the | |
3024 // "thread_oop" handle. | |
3025 | |
3026 // Set the thread field (a JavaThread *) of the | |
3027 // oop representing the java_lang_Thread to the new thread (a JavaThread *). | |
3028 | |
3029 Handle thread_oop(Thread::current(), | |
3030 JNIHandles::resolve_non_null(jni_thread)); | |
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diff
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3031 assert(InstanceKlass::cast(thread_oop->klass())->is_linked(), |
0 | 3032 "must be initialized"); |
3033 set_threadObj(thread_oop()); | |
3034 java_lang_Thread::set_thread(thread_oop(), this); | |
3035 | |
3036 if (prio == NoPriority) { | |
3037 prio = java_lang_Thread::priority(thread_oop()); | |
3038 assert(prio != NoPriority, "A valid priority should be present"); | |
3039 } | |
3040 | |
3041 // Push the Java priority down to the native thread; needs Threads_lock | |
3042 Thread::set_priority(this, prio); | |
3043 | |
3044 // Add the new thread to the Threads list and set it in motion. | |
3045 // We must have threads lock in order to call Threads::add. | |
3046 // It is crucial that we do not block before the thread is | |
3047 // added to the Threads list for if a GC happens, then the java_thread oop | |
3048 // will not be visited by GC. | |
3049 Threads::add(this); | |
3050 } | |
3051 | |
3052 oop JavaThread::current_park_blocker() { | |
3053 // Support for JSR-166 locks | |
3054 oop thread_oop = threadObj(); | |
242 | 3055 if (thread_oop != NULL && |
3056 JDK_Version::current().supports_thread_park_blocker()) { | |
0 | 3057 return java_lang_Thread::park_blocker(thread_oop); |
3058 } | |
3059 return NULL; | |
3060 } | |
3061 | |
3062 | |
3063 void JavaThread::print_stack_on(outputStream* st) { | |
3064 if (!has_last_Java_frame()) return; | |
3065 ResourceMark rm; | |
3066 HandleMark hm; | |
3067 | |
3068 RegisterMap reg_map(this); | |
3069 vframe* start_vf = last_java_vframe(®_map); | |
3070 int count = 0; | |
3071 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3072 if (f->is_java_frame()) { | |
3073 javaVFrame* jvf = javaVFrame::cast(f); | |
3074 java_lang_Throwable::print_stack_element(st, jvf->method(), jvf->bci()); | |
3075 | |
3076 // Print out lock information | |
3077 if (JavaMonitorsInStackTrace) { | |
3078 jvf->print_lock_info_on(st, count); | |
3079 } | |
3080 } else { | |
3081 // Ignore non-Java frames | |
3082 } | |
3083 | |
3084 // Bail-out case for too deep stacks | |
3085 count++; | |
3086 if (MaxJavaStackTraceDepth == count) return; | |
3087 } | |
3088 } | |
3089 | |
3090 | |
3091 // JVMTI PopFrame support | |
3092 void JavaThread::popframe_preserve_args(ByteSize size_in_bytes, void* start) { | |
3093 assert(_popframe_preserved_args == NULL, "should not wipe out old PopFrame preserved arguments"); | |
3094 if (in_bytes(size_in_bytes) != 0) { | |
6197 | 3095 _popframe_preserved_args = NEW_C_HEAP_ARRAY(char, in_bytes(size_in_bytes), mtThread); |
0 | 3096 _popframe_preserved_args_size = in_bytes(size_in_bytes); |
1603
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1584
diff
changeset
|
3097 Copy::conjoint_jbytes(start, _popframe_preserved_args, _popframe_preserved_args_size); |
0 | 3098 } |
3099 } | |
3100 | |
3101 void* JavaThread::popframe_preserved_args() { | |
3102 return _popframe_preserved_args; | |
3103 } | |
3104 | |
3105 ByteSize JavaThread::popframe_preserved_args_size() { | |
3106 return in_ByteSize(_popframe_preserved_args_size); | |
3107 } | |
3108 | |
3109 WordSize JavaThread::popframe_preserved_args_size_in_words() { | |
3110 int sz = in_bytes(popframe_preserved_args_size()); | |
3111 assert(sz % wordSize == 0, "argument size must be multiple of wordSize"); | |
3112 return in_WordSize(sz / wordSize); | |
3113 } | |
3114 | |
3115 void JavaThread::popframe_free_preserved_args() { | |
3116 assert(_popframe_preserved_args != NULL, "should not free PopFrame preserved arguments twice"); | |
6197 | 3117 FREE_C_HEAP_ARRAY(char, (char*) _popframe_preserved_args, mtThread); |
0 | 3118 _popframe_preserved_args = NULL; |
3119 _popframe_preserved_args_size = 0; | |
3120 } | |
3121 | |
3122 #ifndef PRODUCT | |
3123 | |
3124 void JavaThread::trace_frames() { | |
3125 tty->print_cr("[Describe stack]"); | |
3126 int frame_no = 1; | |
3127 for(StackFrameStream fst(this); !fst.is_done(); fst.next()) { | |
3128 tty->print(" %d. ", frame_no++); | |
3129 fst.current()->print_value_on(tty,this); | |
3130 tty->cr(); | |
3131 } | |
3132 } | |
3133 | |
3908
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diff
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|
3134 class PrintAndVerifyOopClosure: public OopClosure { |
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7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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3899
diff
changeset
|
3135 protected: |
7588156f5cf9
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parents:
3899
diff
changeset
|
3136 template <class T> inline void do_oop_work(T* p) { |
7588156f5cf9
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parents:
3899
diff
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|
3137 oop obj = oopDesc::load_decode_heap_oop(p); |
7588156f5cf9
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parents:
3899
diff
changeset
|
3138 if (obj == NULL) return; |
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diff
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|
3139 tty->print(INTPTR_FORMAT ": ", p); |
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parents:
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diff
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|
3140 if (obj->is_oop_or_null()) { |
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3899
diff
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|
3141 if (obj->is_objArray()) { |
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parents:
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diff
changeset
|
3142 tty->print_cr("valid objArray: " INTPTR_FORMAT, (oopDesc*) obj); |
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|
3143 } else { |
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diff
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|
3144 obj->print(); |
7588156f5cf9
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diff
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|
3145 } |
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diff
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|
3146 } else { |
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parents:
3899
diff
changeset
|
3147 tty->print_cr("invalid oop: " INTPTR_FORMAT, (oopDesc*) obj); |
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diff
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|
3148 } |
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parents:
3899
diff
changeset
|
3149 tty->cr(); |
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diff
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|
3150 } |
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parents:
3899
diff
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|
3151 public: |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
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parents:
3899
diff
changeset
|
3152 virtual void do_oop(oop* p) { do_oop_work(p); } |
7588156f5cf9
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parents:
3899
diff
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|
3153 virtual void do_oop(narrowOop* p) { do_oop_work(p); } |
7588156f5cf9
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3899
diff
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|
3154 }; |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3155 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3156 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3157 static void oops_print(frame* f, const RegisterMap *map) { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3158 PrintAndVerifyOopClosure print; |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3159 f->print_value(); |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
3160 f->oops_do(&print, NULL, NULL, (RegisterMap*)map); |
3908
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3161 } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3162 |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3163 // Print our all the locations that contain oops and whether they are |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3164 // valid or not. This useful when trying to find the oldest frame |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3165 // where an oop has gone bad since the frame walk is from youngest to |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3166 // oldest. |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3167 void JavaThread::trace_oops() { |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3168 tty->print_cr("[Trace oops]"); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3169 frames_do(oops_print); |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3170 } |
7588156f5cf9
7051798: SA-JDI: NPE in Frame.addressOfStackSlot(Frame.java:244)
never
parents:
3899
diff
changeset
|
3171 |
0 | 3172 |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3173 #ifdef ASSERT |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3174 // Print or validate the layout of stack frames |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3175 void JavaThread::print_frame_layout(int depth, bool validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3176 ResourceMark rm; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3177 PRESERVE_EXCEPTION_MARK; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3178 FrameValues values; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3179 int frame_no = 0; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3180 for(StackFrameStream fst(this, false); !fst.is_done(); fst.next()) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3181 fst.current()->describe(values, ++frame_no); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3182 if (depth == frame_no) break; |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3183 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3184 if (validate_only) { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3185 values.validate(); |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3186 } else { |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3187 tty->print_cr("[Describe stack layout]"); |
4042
b20d64f83668
7090904: JSR 292: JRuby junit test crashes in PSScavengeRootsClosure::do_oop
twisti
parents:
4007
diff
changeset
|
3188 values.print(this); |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3189 } |
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3190 } |
3388
a80577f854f9
7045513: JSR 292 inlining causes crashes in methodHandleWalk.cpp
never
parents:
3384
diff
changeset
|
3191 #endif |
3336
2e038ad0c1d0
7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents:
2416
diff
changeset
|
3192 |
0 | 3193 void JavaThread::trace_stack_from(vframe* start_vf) { |
3194 ResourceMark rm; | |
3195 int vframe_no = 1; | |
3196 for (vframe* f = start_vf; f; f = f->sender() ) { | |
3197 if (f->is_java_frame()) { | |
3198 javaVFrame::cast(f)->print_activation(vframe_no++); | |
3199 } else { | |
3200 f->print(); | |
3201 } | |
3202 if (vframe_no > StackPrintLimit) { | |
3203 tty->print_cr("...<more frames>..."); | |
3204 return; | |
3205 } | |
3206 } | |
3207 } | |
3208 | |
3209 | |
3210 void JavaThread::trace_stack() { | |
3211 if (!has_last_Java_frame()) return; | |
3212 ResourceMark rm; | |
3213 HandleMark hm; | |
3214 RegisterMap reg_map(this); | |
3215 trace_stack_from(last_java_vframe(®_map)); | |
3216 } | |
3217 | |
3218 | |
3219 #endif // PRODUCT | |
3220 | |
3221 | |
3222 javaVFrame* JavaThread::last_java_vframe(RegisterMap *reg_map) { | |
3223 assert(reg_map != NULL, "a map must be given"); | |
3224 frame f = last_frame(); | |
3225 for (vframe* vf = vframe::new_vframe(&f, reg_map, this); vf; vf = vf->sender() ) { | |
3226 if (vf->is_java_frame()) return javaVFrame::cast(vf); | |
3227 } | |
3228 return NULL; | |
3229 } | |
3230 | |
3231 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3232 Klass* JavaThread::security_get_caller_class(int depth) { |
0 | 3233 vframeStream vfst(this); |
3234 vfst.security_get_caller_frame(depth); | |
3235 if (!vfst.at_end()) { | |
3236 return vfst.method()->method_holder(); | |
3237 } | |
3238 return NULL; | |
3239 } | |
3240 | |
3241 static void compiler_thread_entry(JavaThread* thread, TRAPS) { | |
3242 assert(thread->is_Compiler_thread(), "must be compiler thread"); | |
3243 CompileBroker::compiler_thread_loop(); | |
3244 } | |
3245 | |
3246 // Create a CompilerThread | |
3247 CompilerThread::CompilerThread(CompileQueue* queue, CompilerCounters* counters) | |
3248 : JavaThread(&compiler_thread_entry) { | |
3249 _env = NULL; | |
3250 _log = NULL; | |
3251 _task = NULL; | |
3252 _queue = queue; | |
3253 _counters = counters; | |
3254 | |
3255 #ifndef PRODUCT | |
3256 _ideal_graph_printer = NULL; | |
3257 #endif | |
3258 } | |
3259 | |
3260 // ======= Threads ======== | |
3261 | |
3262 // The Threads class links together all active threads, and provides | |
3263 // operations over all threads. It is protected by its own Mutex | |
3264 // lock, which is also used in other contexts to protect thread | |
3265 // operations from having the thread being operated on from exiting | |
3266 // and going away unexpectedly (e.g., safepoint synchronization) | |
3267 | |
3268 JavaThread* Threads::_thread_list = NULL; | |
3269 int Threads::_number_of_threads = 0; | |
3270 int Threads::_number_of_non_daemon_threads = 0; | |
3271 int Threads::_return_code = 0; | |
3272 size_t JavaThread::_stack_size_at_create = 0; | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3273 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3274 bool Threads::_vm_complete = false; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3275 #endif |
0 | 3276 |
3277 // All JavaThreads | |
3278 #define ALL_JAVA_THREADS(X) for (JavaThread* X = _thread_list; X; X = X->next()) | |
3279 | |
3280 void os_stream(); | |
3281 | |
3282 // All JavaThreads + all non-JavaThreads (i.e., every thread in the system) | |
3283 void Threads::threads_do(ThreadClosure* tc) { | |
3284 assert_locked_or_safepoint(Threads_lock); | |
3285 // ALL_JAVA_THREADS iterates through all JavaThreads | |
3286 ALL_JAVA_THREADS(p) { | |
3287 tc->do_thread(p); | |
3288 } | |
3289 // Someday we could have a table or list of all non-JavaThreads. | |
3290 // For now, just manually iterate through them. | |
3291 tc->do_thread(VMThread::vm_thread()); | |
3292 Universe::heap()->gc_threads_do(tc); | |
323
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3293 WatcherThread *wt = WatcherThread::watcher_thread(); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3294 // Strictly speaking, the following NULL check isn't sufficient to make sure |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3295 // the data for WatcherThread is still valid upon being examined. However, |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3296 // considering that WatchThread terminates when the VM is on the way to |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3297 // exit at safepoint, the chance of the above is extremely small. The right |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3298 // way to prevent termination of WatcherThread would be to acquire |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3299 // Terminator_lock, but we can't do that without violating the lock rank |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3300 // checking in some cases. |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3301 if (wt != NULL) |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3302 tc->do_thread(wt); |
b33eef719520
6740526: sun/management/HotspotThreadMBean/GetInternalThreads.java test failed
xlu
parents:
286
diff
changeset
|
3303 |
0 | 3304 // If CompilerThreads ever become non-JavaThreads, add them here |
3305 } | |
3306 | |
3307 jint Threads::create_vm(JavaVMInitArgs* args, bool* canTryAgain) { | |
3308 | |
242 | 3309 extern void JDK_Version_init(); |
3310 | |
0 | 3311 // Check version |
3312 if (!is_supported_jni_version(args->version)) return JNI_EVERSION; | |
3313 | |
3314 // Initialize the output stream module | |
3315 ostream_init(); | |
3316 | |
3317 // Process java launcher properties. | |
3318 Arguments::process_sun_java_launcher_properties(args); | |
3319 | |
3320 // Initialize the os module before using TLS | |
3321 os::init(); | |
3322 | |
10879
d55f24eac4b1
PTX support for Linux
Morris Meyer <morris.meyer@oracle.com>
parents:
10408
diff
changeset
|
3323 // Probe for existance of supported GPU and initialize it if one |
d55f24eac4b1
PTX support for Linux
Morris Meyer <morris.meyer@oracle.com>
parents:
10408
diff
changeset
|
3324 // exists. |
9430
147162b27799
GRAAL-234 - PTX code loading
Morris Meyer <morris.meyer@oracle.com>
parents:
9088
diff
changeset
|
3325 gpu::init(); |
147162b27799
GRAAL-234 - PTX code loading
Morris Meyer <morris.meyer@oracle.com>
parents:
9088
diff
changeset
|
3326 |
0 | 3327 // Initialize system properties. |
3328 Arguments::init_system_properties(); | |
3329 | |
242 | 3330 // So that JDK version can be used as a discrimintor when parsing arguments |
3331 JDK_Version_init(); | |
3332 | |
1864
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3333 // Update/Initialize System properties after JDK version number is known |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3334 Arguments::init_version_specific_system_properties(); |
dfb38ea7da17
6988363: Rebrand vm vendor property settings (jdk7 only)
zgu
parents:
1731
diff
changeset
|
3335 |
0 | 3336 // Parse arguments |
3337 jint parse_result = Arguments::parse(args); | |
3338 if (parse_result != JNI_OK) return parse_result; | |
3339 | |
3340 if (PauseAtStartup) { | |
3341 os::pause(); | |
3342 } | |
3343 | |
4006 | 3344 #ifndef USDT2 |
0 | 3345 HS_DTRACE_PROBE(hotspot, vm__init__begin); |
4006 | 3346 #else /* USDT2 */ |
3347 HOTSPOT_VM_INIT_BEGIN(); | |
3348 #endif /* USDT2 */ | |
0 | 3349 |
3350 // Record VM creation timing statistics | |
3351 TraceVmCreationTime create_vm_timer; | |
3352 create_vm_timer.start(); | |
3353 | |
3354 // Timing (must come after argument parsing) | |
3355 TraceTime timer("Create VM", TraceStartupTime); | |
3356 | |
3357 // Initialize the os module after parsing the args | |
3358 jint os_init_2_result = os::init_2(); | |
3359 if (os_init_2_result != JNI_OK) return os_init_2_result; | |
3360 | |
7177
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3361 jint adjust_after_os_result = Arguments::adjust_after_os(); |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3362 if (adjust_after_os_result != JNI_OK) return adjust_after_os_result; |
53715fb1597d
7198334: UseNUMA modifies system parameters on non-NUMA system
brutisso
parents:
6985
diff
changeset
|
3363 |
6197 | 3364 // intialize TLS |
3365 ThreadLocalStorage::init(); | |
3366 | |
3367 // Bootstrap native memory tracking, so it can start recording memory | |
3368 // activities before worker thread is started. This is the first phase | |
3369 // of bootstrapping, VM is currently running in single-thread mode. | |
3370 MemTracker::bootstrap_single_thread(); | |
3371 | |
0 | 3372 // Initialize output stream logging |
3373 ostream_init_log(); | |
3374 | |
3375 // Convert -Xrun to -agentlib: if there is no JVM_OnLoad | |
3376 // Must be before create_vm_init_agents() | |
3377 if (Arguments::init_libraries_at_startup()) { | |
3378 convert_vm_init_libraries_to_agents(); | |
3379 } | |
3380 | |
3381 // Launch -agentlib/-agentpath and converted -Xrun agents | |
3382 if (Arguments::init_agents_at_startup()) { | |
3383 create_vm_init_agents(); | |
3384 } | |
3385 | |
3386 // Initialize Threads state | |
3387 _thread_list = NULL; | |
3388 _number_of_threads = 0; | |
3389 _number_of_non_daemon_threads = 0; | |
3390 | |
3391 // Initialize global data structures and create system classes in heap | |
3392 vm_init_globals(); | |
3393 | |
3394 // Attach the main thread to this os thread | |
3395 JavaThread* main_thread = new JavaThread(); | |
3396 main_thread->set_thread_state(_thread_in_vm); | |
3397 // must do this before set_active_handles and initialize_thread_local_storage | |
3398 // Note: on solaris initialize_thread_local_storage() will (indirectly) | |
3399 // change the stack size recorded here to one based on the java thread | |
3400 // stacksize. This adjusted size is what is used to figure the placement | |
3401 // of the guard pages. | |
3402 main_thread->record_stack_base_and_size(); | |
3403 main_thread->initialize_thread_local_storage(); | |
3404 | |
3405 main_thread->set_active_handles(JNIHandleBlock::allocate_block()); | |
3406 | |
3407 if (!main_thread->set_as_starting_thread()) { | |
3408 vm_shutdown_during_initialization( | |
3409 "Failed necessary internal allocation. Out of swap space"); | |
3410 delete main_thread; | |
3411 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3412 return JNI_ENOMEM; | |
3413 } | |
3414 | |
3415 // Enable guard page *after* os::create_main_thread(), otherwise it would | |
3416 // crash Linux VM, see notes in os_linux.cpp. | |
3417 main_thread->create_stack_guard_pages(); | |
3418 | |
1878 | 3419 // Initialize Java-Level synchronization subsystem |
3420 ObjectMonitor::Initialize() ; | |
0 | 3421 |
6197 | 3422 // Second phase of bootstrapping, VM is about entering multi-thread mode |
3423 MemTracker::bootstrap_multi_thread(); | |
3424 | |
0 | 3425 // Initialize global modules |
3426 jint status = init_globals(); | |
3427 if (status != JNI_OK) { | |
3428 delete main_thread; | |
3429 *canTryAgain = false; // don't let caller call JNI_CreateJavaVM again | |
3430 return status; | |
3431 } | |
3432 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3433 // Should be done after the heap is fully created |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3434 main_thread->cache_global_variables(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3435 |
0 | 3436 HandleMark hm; |
3437 | |
3438 { MutexLocker mu(Threads_lock); | |
3439 Threads::add(main_thread); | |
3440 } | |
3441 | |
3442 // Any JVMTI raw monitors entered in onload will transition into | |
3443 // real raw monitor. VM is setup enough here for raw monitor enter. | |
3444 JvmtiExport::transition_pending_onload_raw_monitors(); | |
3445 | |
6197 | 3446 // Fully start NMT |
3447 MemTracker::start(); | |
3448 | |
0 | 3449 // Create the VMThread |
3450 { TraceTime timer("Start VMThread", TraceStartupTime); | |
3451 VMThread::create(); | |
3452 Thread* vmthread = VMThread::vm_thread(); | |
3453 | |
3454 if (!os::create_thread(vmthread, os::vm_thread)) | |
3455 vm_exit_during_initialization("Cannot create VM thread. Out of system resources."); | |
3456 | |
3457 // Wait for the VM thread to become ready, and VMThread::run to initialize | |
3458 // Monitors can have spurious returns, must always check another state flag | |
3459 { | |
3460 MutexLocker ml(Notify_lock); | |
3461 os::start_thread(vmthread); | |
3462 while (vmthread->active_handles() == NULL) { | |
3463 Notify_lock->wait(); | |
3464 } | |
3465 } | |
3466 } | |
3467 | |
3468 assert (Universe::is_fully_initialized(), "not initialized"); | |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3469 if (VerifyDuringStartup) { |
10186
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3470 // Make sure we're starting with a clean slate. |
b06ac540229e
8013132: Add a flag to turn off the output of the verbose verification code
stefank
parents:
9071
diff
changeset
|
3471 VM_Verify verify_op; |
9071
68fe50d4f1d5
8011343: Add new flag for verifying the heap during startup
johnc
parents:
8855
diff
changeset
|
3472 VMThread::execute(&verify_op); |
8855
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3473 } |
24ef5fb05e0f
8010463: G1: Crashes with -UseTLAB and heap verification
johnc
parents:
8793
diff
changeset
|
3474 |
0 | 3475 EXCEPTION_MARK; |
3476 | |
3477 // At this point, the Universe is initialized, but we have not executed | |
3478 // any byte code. Now is a good time (the only time) to dump out the | |
3479 // internal state of the JVM for sharing. | |
3480 if (DumpSharedSpaces) { | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3481 MetaspaceShared::preload_and_dump(CHECK_0); |
0 | 3482 ShouldNotReachHere(); |
3483 } | |
3484 | |
3485 // Always call even when there are not JVMTI environments yet, since environments | |
3486 // may be attached late and JVMTI must track phases of VM execution | |
3487 JvmtiExport::enter_start_phase(); | |
3488 | |
3489 // Notify JVMTI agents that VM has started (JNI is up) - nop if no agents. | |
3490 JvmtiExport::post_vm_start(); | |
3491 | |
3492 { | |
3493 TraceTime timer("Initialize java.lang classes", TraceStartupTime); | |
3494 | |
3495 if (EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3496 create_vm_init_libraries(); | |
3497 } | |
3498 | |
7608 | 3499 initialize_class(vmSymbols::java_lang_String(), CHECK_0); |
0 | 3500 |
3501 // Initialize java_lang.System (needed before creating the thread) | |
7608 | 3502 initialize_class(vmSymbols::java_lang_System(), CHECK_0); |
3503 initialize_class(vmSymbols::java_lang_ThreadGroup(), CHECK_0); | |
3504 Handle thread_group = create_initial_thread_group(CHECK_0); | |
3505 Universe::set_main_thread_group(thread_group()); | |
3506 initialize_class(vmSymbols::java_lang_Thread(), CHECK_0); | |
3507 oop thread_object = create_initial_thread(thread_group, main_thread, CHECK_0); | |
3508 main_thread->set_threadObj(thread_object); | |
3509 // Set thread status to running since main thread has | |
3510 // been started and running. | |
3511 java_lang_Thread::set_thread_status(thread_object, | |
3512 java_lang_Thread::RUNNABLE); | |
3513 | |
3514 // The VM creates & returns objects of this class. Make sure it's initialized. | |
3515 initialize_class(vmSymbols::java_lang_Class(), CHECK_0); | |
3516 | |
3517 // The VM preresolves methods to these classes. Make sure that they get initialized | |
3518 initialize_class(vmSymbols::java_lang_reflect_Method(), CHECK_0); | |
3519 initialize_class(vmSymbols::java_lang_ref_Finalizer(), CHECK_0); | |
3520 call_initializeSystemClass(CHECK_0); | |
3521 | |
3522 // get the Java runtime name after java.lang.System is initialized | |
3523 JDK_Version::set_runtime_name(get_java_runtime_name(THREAD)); | |
3524 JDK_Version::set_runtime_version(get_java_runtime_version(THREAD)); | |
0 | 3525 |
3526 // an instance of OutOfMemory exception has been allocated earlier | |
7608 | 3527 initialize_class(vmSymbols::java_lang_OutOfMemoryError(), CHECK_0); |
3528 initialize_class(vmSymbols::java_lang_NullPointerException(), CHECK_0); | |
3529 initialize_class(vmSymbols::java_lang_ClassCastException(), CHECK_0); | |
3530 initialize_class(vmSymbols::java_lang_ArrayStoreException(), CHECK_0); | |
3531 initialize_class(vmSymbols::java_lang_ArithmeticException(), CHECK_0); | |
3532 initialize_class(vmSymbols::java_lang_StackOverflowError(), CHECK_0); | |
3533 initialize_class(vmSymbols::java_lang_IllegalMonitorStateException(), CHECK_0); | |
3534 initialize_class(vmSymbols::java_lang_IllegalArgumentException(), CHECK_0); | |
2416
38fea01eb669
6817525: turn on method handle functionality by default for JSR 292
twisti
parents:
2376
diff
changeset
|
3535 } |
0 | 3536 |
3537 // See : bugid 4211085. | |
3538 // Background : the static initializer of java.lang.Compiler tries to read | |
3539 // property"java.compiler" and read & write property "java.vm.info". | |
3540 // When a security manager is installed through the command line | |
3541 // option "-Djava.security.manager", the above properties are not | |
3542 // readable and the static initializer for java.lang.Compiler fails | |
3543 // resulting in a NoClassDefFoundError. This can happen in any | |
3544 // user code which calls methods in java.lang.Compiler. | |
3545 // Hack : the hack is to pre-load and initialize this class, so that only | |
3546 // system domains are on the stack when the properties are read. | |
3547 // Currently even the AWT code has calls to methods in java.lang.Compiler. | |
3548 // On the classic VM, java.lang.Compiler is loaded very early to load the JIT. | |
3549 // Future Fix : the best fix is to grant everyone permissions to read "java.compiler" and | |
3550 // read and write"java.vm.info" in the default policy file. See bugid 4211383 | |
3551 // Once that is done, we should remove this hack. | |
2177
3582bf76420e
6990754: Use native memory and reference counting to implement SymbolTable
coleenp
parents:
2162
diff
changeset
|
3552 initialize_class(vmSymbols::java_lang_Compiler(), CHECK_0); |
0 | 3553 |
3554 // More hackery - the static initializer of java.lang.Compiler adds the string "nojit" to | |
3555 // the java.vm.info property if no jit gets loaded through java.lang.Compiler (the hotspot | |
3556 // compiler does not get loaded through java.lang.Compiler). "java -version" with the | |
3557 // hotspot vm says "nojit" all the time which is confusing. So, we reset it here. | |
3558 // This should also be taken out as soon as 4211383 gets fixed. | |
3559 reset_vm_info_property(CHECK_0); | |
3560 | |
3561 quicken_jni_functions(); | |
3562 | |
4932
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3563 // Must be run after init_ft which initializes ft_enabled |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3564 if (TRACE_INITIALIZE() != JNI_OK) { |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3565 vm_exit_during_initialization("Failed to initialize tracing backend"); |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3566 } |
f1cb6f9cfe21
7145243: Need additional specializations for argument parsing framework
fparain
parents:
4873
diff
changeset
|
3567 |
0 | 3568 // Set flag that basic initialization has completed. Used by exceptions and various |
3569 // debug stuff, that does not work until all basic classes have been initialized. | |
3570 set_init_completed(); | |
3571 | |
4006 | 3572 #ifndef USDT2 |
0 | 3573 HS_DTRACE_PROBE(hotspot, vm__init__end); |
4006 | 3574 #else /* USDT2 */ |
3575 HOTSPOT_VM_INIT_END(); | |
3576 #endif /* USDT2 */ | |
0 | 3577 |
3578 // record VM initialization completion time | |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3579 #if INCLUDE_MANAGEMENT |
0 | 3580 Management::record_vm_init_completed(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3581 #endif // INCLUDE_MANAGEMENT |
0 | 3582 |
3583 // Compute system loader. Note that this has to occur after set_init_completed, since | |
3584 // valid exceptions may be thrown in the process. | |
3585 // Note that we do not use CHECK_0 here since we are inside an EXCEPTION_MARK and | |
3586 // set_init_completed has just been called, causing exceptions not to be shortcut | |
3587 // anymore. We call vm_exit_during_initialization directly instead. | |
3588 SystemDictionary::compute_java_system_loader(THREAD); | |
3589 if (HAS_PENDING_EXCEPTION) { | |
3590 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3591 } | |
3592 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3593 #if INCLUDE_ALL_GCS |
0 | 3594 // Support for ConcurrentMarkSweep. This should be cleaned up |
342
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3595 // and better encapsulated. The ugly nested if test would go away |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3596 // once things are properly refactored. XXX YSR |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3597 if (UseConcMarkSweepGC || UseG1GC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3598 if (UseConcMarkSweepGC) { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3599 ConcurrentMarkSweepThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3600 } else { |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3601 ConcurrentMarkThread::makeSurrogateLockerThread(THREAD); |
37f87013dfd8
6711316: Open source the Garbage-First garbage collector
ysr
parents:
62
diff
changeset
|
3602 } |
0 | 3603 if (HAS_PENDING_EXCEPTION) { |
3604 vm_exit_during_initialization(Handle(THREAD, PENDING_EXCEPTION)); | |
3605 } | |
3606 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
3607 #endif // INCLUDE_ALL_GCS |
0 | 3608 |
3609 // Always call even when there are not JVMTI environments yet, since environments | |
3610 // may be attached late and JVMTI must track phases of VM execution | |
3611 JvmtiExport::enter_live_phase(); | |
3612 | |
3613 // Signal Dispatcher needs to be started before VMInit event is posted | |
3614 os::signal_init(); | |
3615 | |
3616 // Start Attach Listener if +StartAttachListener or it can't be started lazily | |
3617 if (!DisableAttachMechanism) { | |
11139
2e8f19c2feef
7162400: Intermittent java.io.IOException: Bad file number during HotSpotVirtualMachine.executeCommand
allwin
parents:
11136
diff
changeset
|
3618 AttachListener::vm_start(); |
0 | 3619 if (StartAttachListener || AttachListener::init_at_startup()) { |
3620 AttachListener::init(); | |
3621 } | |
3622 } | |
3623 | |
3624 // Launch -Xrun agents | |
3625 // Must be done in the JVMTI live phase so that for backward compatibility the JDWP | |
3626 // back-end can launch with -Xdebug -Xrunjdwp. | |
3627 if (!EagerXrunInit && Arguments::init_libraries_at_startup()) { | |
3628 create_vm_init_libraries(); | |
3629 } | |
3630 | |
6002
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3631 // Notify JVMTI agents that VM initialization is complete - nop if no agents. |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3632 JvmtiExport::post_vm_initialized(); |
df4cd4aac5c1
7160924: jvmti: GetPhase returns incorrect phase before VMInit event is issued
rbackman
parents:
5928
diff
changeset
|
3633 |
10405 | 3634 if (TRACE_START() != JNI_OK) { |
3635 vm_exit_during_initialization("Failed to start tracing backend."); | |
4800
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3636 } |
94ec88ca68e2
7115199: Add event tracing hooks and Java Flight Recorder infrastructure
phh
parents:
4095
diff
changeset
|
3637 |
3799
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3638 if (CleanChunkPoolAsync) { |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3639 Chunk::start_chunk_pool_cleaner_task(); |
48048b59a551
7061204: clean the chunk table synchronously in embedded builds
jcoomes
parents:
3769
diff
changeset
|
3640 } |
0 | 3641 |
3642 // initialize compiler(s) | |
7212
291ffc492eb6
Merge with http://hg.openjdk.java.net/hsx/hsx25/hotspot/
Doug Simon <doug.simon@oracle.com>
diff
changeset
|
3643 #if defined(COMPILER1) || defined(COMPILER2) || defined(SHARK) || defined(GRAALVM) |
0 | 3644 CompileBroker::compilation_init(); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3645 #endif |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3646 |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3647 #if INCLUDE_MANAGEMENT |
0 | 3648 Management::initialize(THREAD); |
6854
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3649 #endif // INCLUDE_MANAGEMENT |
fb19af007ffc
7189254: Change makefiles for more flexibility to override defaults
jprovino
parents:
6769
diff
changeset
|
3650 |
0 | 3651 if (HAS_PENDING_EXCEPTION) { |
3652 // management agent fails to start possibly due to | |
3653 // configuration problem and is responsible for printing | |
3654 // stack trace if appropriate. Simply exit VM. | |
3655 vm_exit(1); | |
3656 } | |
3657 | |
3658 if (Arguments::has_profile()) FlatProfiler::engage(main_thread, true); | |
3659 if (MemProfiling) MemProfiler::engage(); | |
3660 StatSampler::engage(); | |
3661 if (CheckJNICalls) JniPeriodicChecker::engage(); | |
3662 | |
3663 BiasedLocking::init(); | |
3664 | |
2129
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3665 if (JDK_Version::current().post_vm_init_hook_enabled()) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3666 call_postVMInitHook(THREAD); |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3667 // The Java side of PostVMInitHook.run must deal with all |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3668 // exceptions and provide means of diagnosis. |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3669 if (HAS_PENDING_EXCEPTION) { |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3670 CLEAR_PENDING_EXCEPTION; |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3671 } |
8f8dfba37802
6994753: Implement optional hook to a Java method at VM startup.
kevinw
parents:
2126
diff
changeset
|
3672 } |
0 | 3673 |
6939
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3674 { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3675 MutexLockerEx ml(PeriodicTask_lock, Mutex::_no_safepoint_check_flag); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3676 // Make sure the watcher thread can be started by WatcherThread::start() |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3677 // or by dynamic enrollment. |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3678 WatcherThread::make_startable(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3679 // Start up the WatcherThread if there are any periodic tasks |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3680 // NOTE: All PeriodicTasks should be registered by now. If they |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3681 // aren't, late joiners might appear to start slowly (we might |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3682 // take a while to process their first tick). |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3683 if (PeriodicTask::num_tasks() > 0) { |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3684 WatcherThread::start(); |
c284cf4781f0
7127792: Add the ability to change an existing PeriodicTask's execution interval
rbackman
parents:
6921
diff
changeset
|
3685 } |
0 | 3686 } |
3687 | |
1681
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3688 // Give os specific code one last chance to start |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3689 os::init_3(); |
126ea7725993
6953477: Increase portability and flexibility of building Hotspot
bobv
parents:
1608
diff
changeset
|
3690 |
0 | 3691 create_vm_timer.end(); |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3692 #ifdef ASSERT |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3693 _vm_complete = true; |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
3694 #endif |
0 | 3695 return JNI_OK; |
3696 } | |
3697 | |
3698 // type for the Agent_OnLoad and JVM_OnLoad entry points | |
3699 extern "C" { | |
3700 typedef jint (JNICALL *OnLoadEntry_t)(JavaVM *, char *, void *); | |
3701 } | |
3702 // Find a command line agent library and return its entry point for | |
3703 // -agentlib: -agentpath: -Xrun | |
3704 // num_symbol_entries must be passed-in since only the caller knows the number of symbols in the array. | |
3705 static OnLoadEntry_t lookup_on_load(AgentLibrary* agent, const char *on_load_symbols[], size_t num_symbol_entries) { | |
3706 OnLoadEntry_t on_load_entry = NULL; | |
3707 void *library = agent->os_lib(); // check if we have looked it up before | |
3708 | |
3709 if (library == NULL) { | |
3710 char buffer[JVM_MAXPATHLEN]; | |
3711 char ebuf[1024]; | |
3712 const char *name = agent->name(); | |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3713 const char *msg = "Could not find agent library "; |
0 | 3714 |
3715 if (agent->is_absolute_path()) { | |
1980
828eafbd85cc
6348631: remove the use of the HPI library from Hotspot
ikrylov
parents:
1972
diff
changeset
|
3716 library = os::dll_load(name, ebuf, sizeof ebuf); |
0 | 3717 if (library == NULL) { |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3718 const char *sub_msg = " in absolute path, with error: "; |
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3719 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3720 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3721 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3722 // If we can't find the agent, exit. |
1694
ab3fd720516c
6378314: Bad warning message when agent library not found. local directory is not searched.
rasbold
parents:
1681
diff
changeset
|
3723 vm_exit_during_initialization(buf, NULL); |
6197 | 3724 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3725 } |
3726 } else { | |
3727 // Try to load the agent from the standard dll directory | |
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3728 if (os::dll_build_name(buffer, sizeof(buffer), Arguments::get_dll_dir(), |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3729 name)) { |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3730 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3731 } |
0 | 3732 if (library == NULL) { // Try the local directory |
3733 char ns[1] = {0}; | |
6966
6cb0d32b828b
8001185: parsing of sun.boot.library.path in os::dll_build_name somewhat broken
bpittore
parents:
6921
diff
changeset
|
3734 if (os::dll_build_name(buffer, sizeof(buffer), ns, name)) { |
6cb0d32b828b
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3735 library = os::dll_load(buffer, ebuf, sizeof ebuf); |
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3736 } |
0 | 3737 if (library == NULL) { |
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3738 const char *sub_msg = " on the library path, with error: "; |
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3739 size_t len = strlen(msg) + strlen(name) + strlen(sub_msg) + strlen(ebuf) + 1; |
6197 | 3740 char *buf = NEW_C_HEAP_ARRAY(char, len, mtThread); |
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3741 jio_snprintf(buf, len, "%s%s%s%s", msg, name, sub_msg, ebuf); |
0 | 3742 // If we can't find the agent, exit. |
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3743 vm_exit_during_initialization(buf, NULL); |
6197 | 3744 FREE_C_HEAP_ARRAY(char, buf, mtThread); |
0 | 3745 } |
3746 } | |
3747 } | |
3748 agent->set_os_lib(library); | |
3749 } | |
3750 | |
3751 // Find the OnLoad function. | |
3752 for (size_t symbol_index = 0; symbol_index < num_symbol_entries; symbol_index++) { | |
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3753 on_load_entry = CAST_TO_FN_PTR(OnLoadEntry_t, os::dll_lookup(library, on_load_symbols[symbol_index])); |
0 | 3754 if (on_load_entry != NULL) break; |
3755 } | |
3756 return on_load_entry; | |
3757 } | |
3758 | |
3759 // Find the JVM_OnLoad entry point | |
3760 static OnLoadEntry_t lookup_jvm_on_load(AgentLibrary* agent) { | |
3761 const char *on_load_symbols[] = JVM_ONLOAD_SYMBOLS; | |
3762 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3763 } | |
3764 | |
3765 // Find the Agent_OnLoad entry point | |
3766 static OnLoadEntry_t lookup_agent_on_load(AgentLibrary* agent) { | |
3767 const char *on_load_symbols[] = AGENT_ONLOAD_SYMBOLS; | |
3768 return lookup_on_load(agent, on_load_symbols, sizeof(on_load_symbols) / sizeof(char*)); | |
3769 } | |
3770 | |
3771 // For backwards compatibility with -Xrun | |
3772 // Convert libraries with no JVM_OnLoad, but which have Agent_OnLoad to be | |
3773 // treated like -agentpath: | |
3774 // Must be called before agent libraries are created | |
3775 void Threads::convert_vm_init_libraries_to_agents() { | |
3776 AgentLibrary* agent; | |
3777 AgentLibrary* next; | |
3778 | |
3779 for (agent = Arguments::libraries(); agent != NULL; agent = next) { | |
3780 next = agent->next(); // cache the next agent now as this agent may get moved off this list | |
3781 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3782 | |
3783 // If there is an JVM_OnLoad function it will get called later, | |
3784 // otherwise see if there is an Agent_OnLoad | |
3785 if (on_load_entry == NULL) { | |
3786 on_load_entry = lookup_agent_on_load(agent); | |
3787 if (on_load_entry != NULL) { | |
3788 // switch it to the agent list -- so that Agent_OnLoad will be called, | |
3789 // JVM_OnLoad won't be attempted and Agent_OnUnload will | |
3790 Arguments::convert_library_to_agent(agent); | |
3791 } else { | |
3792 vm_exit_during_initialization("Could not find JVM_OnLoad or Agent_OnLoad function in the library", agent->name()); | |
3793 } | |
3794 } | |
3795 } | |
3796 } | |
3797 | |
3798 // Create agents for -agentlib: -agentpath: and converted -Xrun | |
3799 // Invokes Agent_OnLoad | |
3800 // Called very early -- before JavaThreads exist | |
3801 void Threads::create_vm_init_agents() { | |
3802 extern struct JavaVM_ main_vm; | |
3803 AgentLibrary* agent; | |
3804 | |
3805 JvmtiExport::enter_onload_phase(); | |
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3806 |
0 | 3807 for (agent = Arguments::agents(); agent != NULL; agent = agent->next()) { |
3808 OnLoadEntry_t on_load_entry = lookup_agent_on_load(agent); | |
3809 | |
3810 if (on_load_entry != NULL) { | |
3811 // Invoke the Agent_OnLoad function | |
3812 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3813 if (err != JNI_OK) { | |
3814 vm_exit_during_initialization("agent library failed to init", agent->name()); | |
3815 } | |
3816 } else { | |
3817 vm_exit_during_initialization("Could not find Agent_OnLoad function in the agent library", agent->name()); | |
3818 } | |
3819 } | |
3820 JvmtiExport::enter_primordial_phase(); | |
3821 } | |
3822 | |
3823 extern "C" { | |
3824 typedef void (JNICALL *Agent_OnUnload_t)(JavaVM *); | |
3825 } | |
3826 | |
3827 void Threads::shutdown_vm_agents() { | |
3828 // Send any Agent_OnUnload notifications | |
3829 const char *on_unload_symbols[] = AGENT_ONUNLOAD_SYMBOLS; | |
3830 extern struct JavaVM_ main_vm; | |
3831 for (AgentLibrary* agent = Arguments::agents(); agent != NULL; agent = agent->next()) { | |
3832 | |
3833 // Find the Agent_OnUnload function. | |
3834 for (uint symbol_index = 0; symbol_index < ARRAY_SIZE(on_unload_symbols); symbol_index++) { | |
3835 Agent_OnUnload_t unload_entry = CAST_TO_FN_PTR(Agent_OnUnload_t, | |
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3836 os::dll_lookup(agent->os_lib(), on_unload_symbols[symbol_index])); |
0 | 3837 |
3838 // Invoke the Agent_OnUnload function | |
3839 if (unload_entry != NULL) { | |
3840 JavaThread* thread = JavaThread::current(); | |
3841 ThreadToNativeFromVM ttn(thread); | |
3842 HandleMark hm(thread); | |
3843 (*unload_entry)(&main_vm); | |
3844 break; | |
3845 } | |
3846 } | |
3847 } | |
3848 } | |
3849 | |
3850 // Called for after the VM is initialized for -Xrun libraries which have not been converted to agent libraries | |
3851 // Invokes JVM_OnLoad | |
3852 void Threads::create_vm_init_libraries() { | |
3853 extern struct JavaVM_ main_vm; | |
3854 AgentLibrary* agent; | |
3855 | |
3856 for (agent = Arguments::libraries(); agent != NULL; agent = agent->next()) { | |
3857 OnLoadEntry_t on_load_entry = lookup_jvm_on_load(agent); | |
3858 | |
3859 if (on_load_entry != NULL) { | |
3860 // Invoke the JVM_OnLoad function | |
3861 JavaThread* thread = JavaThread::current(); | |
3862 ThreadToNativeFromVM ttn(thread); | |
3863 HandleMark hm(thread); | |
3864 jint err = (*on_load_entry)(&main_vm, agent->options(), NULL); | |
3865 if (err != JNI_OK) { | |
3866 vm_exit_during_initialization("-Xrun library failed to init", agent->name()); | |
3867 } | |
3868 } else { | |
3869 vm_exit_during_initialization("Could not find JVM_OnLoad function in -Xrun library", agent->name()); | |
3870 } | |
3871 } | |
3872 } | |
3873 | |
3874 // Last thread running calls java.lang.Shutdown.shutdown() | |
3875 void JavaThread::invoke_shutdown_hooks() { | |
3876 HandleMark hm(this); | |
3877 | |
3878 // We could get here with a pending exception, if so clear it now. | |
3879 if (this->has_pending_exception()) { | |
3880 this->clear_pending_exception(); | |
3881 } | |
3882 | |
3883 EXCEPTION_MARK; | |
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3884 Klass* k = |
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3885 SystemDictionary::resolve_or_null(vmSymbols::java_lang_Shutdown(), |
0 | 3886 THREAD); |
3887 if (k != NULL) { | |
3888 // SystemDictionary::resolve_or_null will return null if there was | |
3889 // an exception. If we cannot load the Shutdown class, just don't | |
3890 // call Shutdown.shutdown() at all. This will mean the shutdown hooks | |
3891 // and finalizers (if runFinalizersOnExit is set) won't be run. | |
3892 // Note that if a shutdown hook was registered or runFinalizersOnExit | |
3893 // was called, the Shutdown class would have already been loaded | |
3894 // (Runtime.addShutdownHook and runFinalizersOnExit will load it). | |
3895 instanceKlassHandle shutdown_klass (THREAD, k); | |
3896 JavaValue result(T_VOID); | |
3897 JavaCalls::call_static(&result, | |
3898 shutdown_klass, | |
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3899 vmSymbols::shutdown_method_name(), |
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3900 vmSymbols::void_method_signature(), |
0 | 3901 THREAD); |
3902 } | |
3903 CLEAR_PENDING_EXCEPTION; | |
3904 } | |
3905 | |
3906 // Threads::destroy_vm() is normally called from jni_DestroyJavaVM() when | |
3907 // the program falls off the end of main(). Another VM exit path is through | |
3908 // vm_exit() when the program calls System.exit() to return a value or when | |
3909 // there is a serious error in VM. The two shutdown paths are not exactly | |
3910 // the same, but they share Shutdown.shutdown() at Java level and before_exit() | |
3911 // and VM_Exit op at VM level. | |
3912 // | |
3913 // Shutdown sequence: | |
6197 | 3914 // + Shutdown native memory tracking if it is on |
0 | 3915 // + Wait until we are the last non-daemon thread to execute |
3916 // <-- every thing is still working at this moment --> | |
3917 // + Call java.lang.Shutdown.shutdown(), which will invoke Java level | |
3918 // shutdown hooks, run finalizers if finalization-on-exit | |
3919 // + Call before_exit(), prepare for VM exit | |
3920 // > run VM level shutdown hooks (they are registered through JVM_OnExit(), | |
3921 // currently the only user of this mechanism is File.deleteOnExit()) | |
3922 // > stop flat profiler, StatSampler, watcher thread, CMS threads, | |
3923 // post thread end and vm death events to JVMTI, | |
3924 // stop signal thread | |
3925 // + Call JavaThread::exit(), it will: | |
3926 // > release JNI handle blocks, remove stack guard pages | |
3927 // > remove this thread from Threads list | |
3928 // <-- no more Java code from this thread after this point --> | |
3929 // + Stop VM thread, it will bring the remaining VM to a safepoint and stop | |
3930 // the compiler threads at safepoint | |
3931 // <-- do not use anything that could get blocked by Safepoint --> | |
3932 // + Disable tracing at JNI/JVM barriers | |
3933 // + Set _vm_exited flag for threads that are still running native code | |
3934 // + Delete this thread | |
3935 // + Call exit_globals() | |
3936 // > deletes tty | |
3937 // > deletes PerfMemory resources | |
3938 // + Return to caller | |
3939 | |
3940 bool Threads::destroy_vm() { | |
3941 JavaThread* thread = JavaThread::current(); | |
3942 | |
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3943 #ifdef ASSERT |
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3944 _vm_complete = false; |
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3945 #endif |
0 | 3946 // Wait until we are the last non-daemon thread to execute |
3947 { MutexLocker nu(Threads_lock); | |
3948 while (Threads::number_of_non_daemon_threads() > 1 ) | |
3949 // This wait should make safepoint checks, wait without a timeout, | |
3950 // and wait as a suspend-equivalent condition. | |
3951 // | |
3952 // Note: If the FlatProfiler is running and this thread is waiting | |
3953 // for another non-daemon thread to finish, then the FlatProfiler | |
3954 // is waiting for the external suspend request on this thread to | |
3955 // complete. wait_for_ext_suspend_completion() will eventually | |
3956 // timeout, but that takes time. Making this wait a suspend- | |
3957 // equivalent condition solves that timeout problem. | |
3958 // | |
3959 Threads_lock->wait(!Mutex::_no_safepoint_check_flag, 0, | |
3960 Mutex::_as_suspend_equivalent_flag); | |
3961 } | |
3962 | |
3963 // Hang forever on exit if we are reporting an error. | |
3964 if (ShowMessageBoxOnError && is_error_reported()) { | |
3965 os::infinite_sleep(); | |
3966 } | |
2302
da091bb67459
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|
3967 os::wait_for_keypress_at_exit(); |
0 | 3968 |
3969 if (JDK_Version::is_jdk12x_version()) { | |
3970 // We are the last thread running, so check if finalizers should be run. | |
3971 // For 1.3 or later this is done in thread->invoke_shutdown_hooks() | |
3972 HandleMark rm(thread); | |
3973 Universe::run_finalizers_on_exit(); | |
3974 } else { | |
3975 // run Java level shutdown hooks | |
3976 thread->invoke_shutdown_hooks(); | |
3977 } | |
3978 | |
3979 before_exit(thread); | |
3980 | |
3981 thread->exit(true); | |
3982 | |
3983 // Stop VM thread. | |
3984 { | |
3985 // 4945125 The vm thread comes to a safepoint during exit. | |
3986 // GC vm_operations can get caught at the safepoint, and the | |
3987 // heap is unparseable if they are caught. Grab the Heap_lock | |
3988 // to prevent this. The GC vm_operations will not be able to | |
3989 // queue until after the vm thread is dead. | |
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3990 // After this point, we'll never emerge out of the safepoint before |
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3991 // the VM exits, so concurrent GC threads do not need to be explicitly |
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3992 // stopped; they remain inactive until the process exits. |
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3993 // Note: some concurrent G1 threads may be running during a safepoint, |
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3994 // but these will not be accessing the heap, just some G1-specific side |
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3995 // data structures that are not accessed by any other threads but them |
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3996 // after this point in a terminal safepoint. |
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|
3997 |
0 | 3998 MutexLocker ml(Heap_lock); |
3999 | |
4000 VMThread::wait_for_vm_thread_exit(); | |
4001 assert(SafepointSynchronize::is_at_safepoint(), "VM thread should exit at Safepoint"); | |
4002 VMThread::destroy(); | |
4003 } | |
4004 | |
4005 // clean up ideal graph printers | |
4006 #if defined(COMPILER2) && !defined(PRODUCT) | |
4007 IdealGraphPrinter::clean_up(); | |
4008 #endif | |
4009 | |
4010 // Now, all Java threads are gone except daemon threads. Daemon threads | |
4011 // running Java code or in VM are stopped by the Safepoint. However, | |
4012 // daemon threads executing native code are still running. But they | |
4013 // will be stopped at native=>Java/VM barriers. Note that we can't | |
4014 // simply kill or suspend them, as it is inherently deadlock-prone. | |
4015 | |
4016 #ifndef PRODUCT | |
4017 // disable function tracing at JNI/JVM barriers | |
4018 TraceJNICalls = false; | |
4019 TraceJVMCalls = false; | |
4020 TraceRuntimeCalls = false; | |
4021 #endif | |
4022 | |
4023 VM_Exit::set_vm_exited(); | |
4024 | |
4025 notify_vm_shutdown(); | |
4026 | |
4027 delete thread; | |
4028 | |
4029 // exit_globals() will delete tty | |
4030 exit_globals(); | |
4031 | |
4032 return true; | |
4033 } | |
4034 | |
4035 | |
4036 jboolean Threads::is_supported_jni_version_including_1_1(jint version) { | |
4037 if (version == JNI_VERSION_1_1) return JNI_TRUE; | |
4038 return is_supported_jni_version(version); | |
4039 } | |
4040 | |
4041 | |
4042 jboolean Threads::is_supported_jni_version(jint version) { | |
4043 if (version == JNI_VERSION_1_2) return JNI_TRUE; | |
4044 if (version == JNI_VERSION_1_4) return JNI_TRUE; | |
4045 if (version == JNI_VERSION_1_6) return JNI_TRUE; | |
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4046 if (version == JNI_VERSION_1_8) return JNI_TRUE; |
0 | 4047 return JNI_FALSE; |
4048 } | |
4049 | |
4050 | |
4051 void Threads::add(JavaThread* p, bool force_daemon) { | |
4052 // The threads lock must be owned at this point | |
4053 assert_locked_or_safepoint(Threads_lock); | |
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4054 |
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4055 // See the comment for this method in thread.hpp for its purpose and |
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4056 // why it is called here. |
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|
4057 p->initialize_queues(); |
0 | 4058 p->set_next(_thread_list); |
4059 _thread_list = p; | |
4060 _number_of_threads++; | |
4061 oop threadObj = p->threadObj(); | |
4062 bool daemon = true; | |
4063 // Bootstrapping problem: threadObj can be null for initial | |
4064 // JavaThread (or for threads attached via JNI) | |
4065 if ((!force_daemon) && (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj))) { | |
4066 _number_of_non_daemon_threads++; | |
4067 daemon = false; | |
4068 } | |
4069 | |
6197 | 4070 p->set_safepoint_visible(true); |
4071 | |
0 | 4072 ThreadService::add_thread(p, daemon); |
4073 | |
4074 // Possible GC point. | |
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4075 Events::log(p, "Thread added: " INTPTR_FORMAT, p); |
0 | 4076 } |
4077 | |
4078 void Threads::remove(JavaThread* p) { | |
4079 // Extra scope needed for Thread_lock, so we can check | |
4080 // that we do not remove thread without safepoint code notice | |
4081 { MutexLocker ml(Threads_lock); | |
4082 | |
4083 assert(includes(p), "p must be present"); | |
4084 | |
4085 JavaThread* current = _thread_list; | |
4086 JavaThread* prev = NULL; | |
4087 | |
4088 while (current != p) { | |
4089 prev = current; | |
4090 current = current->next(); | |
4091 } | |
4092 | |
4093 if (prev) { | |
4094 prev->set_next(current->next()); | |
4095 } else { | |
4096 _thread_list = p->next(); | |
4097 } | |
4098 _number_of_threads--; | |
4099 oop threadObj = p->threadObj(); | |
4100 bool daemon = true; | |
4101 if (threadObj == NULL || !java_lang_Thread::is_daemon(threadObj)) { | |
4102 _number_of_non_daemon_threads--; | |
4103 daemon = false; | |
4104 | |
4105 // Only one thread left, do a notify on the Threads_lock so a thread waiting | |
4106 // on destroy_vm will wake up. | |
4107 if (number_of_non_daemon_threads() == 1) | |
4108 Threads_lock->notify_all(); | |
4109 } | |
4110 ThreadService::remove_thread(p, daemon); | |
4111 | |
4112 // Make sure that safepoint code disregard this thread. This is needed since | |
4113 // the thread might mess around with locks after this point. This can cause it | |
4114 // to do callbacks into the safepoint code. However, the safepoint code is not aware | |
4115 // of this thread since it is removed from the queue. | |
4116 p->set_terminated_value(); | |
6197 | 4117 |
4118 // Now, this thread is not visible to safepoint | |
4119 p->set_safepoint_visible(false); | |
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4120 // once the thread becomes safepoint invisible, we can not use its per-thread |
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4121 // recorder. And Threads::do_threads() no longer walks this thread, so we have |
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4122 // to release its per-thread recorder here. |
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|
4123 MemTracker::thread_exiting(p); |
0 | 4124 } // unlock Threads_lock |
4125 | |
4126 // Since Events::log uses a lock, we grab it outside the Threads_lock | |
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4127 Events::log(p, "Thread exited: " INTPTR_FORMAT, p); |
0 | 4128 } |
4129 | |
4130 // Threads_lock must be held when this is called (or must be called during a safepoint) | |
4131 bool Threads::includes(JavaThread* p) { | |
4132 assert(Threads_lock->is_locked(), "sanity check"); | |
4133 ALL_JAVA_THREADS(q) { | |
4134 if (q == p ) { | |
4135 return true; | |
4136 } | |
4137 } | |
4138 return false; | |
4139 } | |
4140 | |
4141 // Operations on the Threads list for GC. These are not explicitly locked, | |
4142 // but the garbage collector must provide a safe context for them to run. | |
4143 // In particular, these things should never be called when the Threads_lock | |
4144 // is held by some other thread. (Note: the Safepoint abstraction also | |
4145 // uses the Threads_lock to gurantee this property. It also makes sure that | |
4146 // all threads gets blocked when exiting or starting). | |
4147 | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4148 void Threads::oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4149 ALL_JAVA_THREADS(p) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4150 p->oops_do(f, cld_f, cf); |
0 | 4151 } |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
parents:
7177
diff
changeset
|
4152 VMThread::vm_thread()->oops_do(f, cld_f, cf); |
0 | 4153 } |
4154 | |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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7177
diff
changeset
|
4155 void Threads::possibly_parallel_oops_do(OopClosure* f, CLDToOopClosure* cld_f, CodeBlobClosure* cf) { |
0 | 4156 // Introduce a mechanism allowing parallel threads to claim threads as |
4157 // root groups. Overhead should be small enough to use all the time, | |
4158 // even in sequential code. | |
4159 SharedHeap* sh = SharedHeap::heap(); | |
4095
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4160 // Cannot yet substitute active_workers for n_par_threads |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
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parents:
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diff
changeset
|
4161 // because of G1CollectedHeap::verify() use of |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4162 // SharedHeap::process_strong_roots(). n_par_threads == 0 will |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4163 // turn off parallelism in process_strong_roots while active_workers |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4164 // is being used for parallelism elsewhere. |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4165 bool is_par = sh->n_par_threads() > 0; |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
parents:
4042
diff
changeset
|
4166 assert(!is_par || |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4167 (SharedHeap::heap()->n_par_threads() == |
bca17e38de00
6593758: RFE: Enhance GC ergonomics to dynamically choose ParallelGCThreads
jmasa
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diff
changeset
|
4168 SharedHeap::heap()->workers()->active_workers()), "Mismatch"); |
0 | 4169 int cp = SharedHeap::heap()->strong_roots_parity(); |
4170 ALL_JAVA_THREADS(p) { | |
4171 if (p->claim_oops_do(is_par, cp)) { | |
7179
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stefank
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7177
diff
changeset
|
4172 p->oops_do(f, cld_f, cf); |
0 | 4173 } |
4174 } | |
4175 VMThread* vmt = VMThread::vm_thread(); | |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4176 if (vmt->claim_oops_do(is_par, cp)) { |
7179
d0aa87f04bd5
8003720: NPG: Method in interpreter stack frame can be deallocated
stefank
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diff
changeset
|
4177 vmt->oops_do(f, cld_f, cf); |
3979
4dfb2df418f2
6484982: G1: process references during evacuation pauses
johnc
parents:
3938
diff
changeset
|
4178 } |
0 | 4179 } |
4180 | |
8001
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8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
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diff
changeset
|
4181 #if INCLUDE_ALL_GCS |
0 | 4182 // Used by ParallelScavenge |
4183 void Threads::create_thread_roots_tasks(GCTaskQueue* q) { | |
4184 ALL_JAVA_THREADS(p) { | |
4185 q->enqueue(new ThreadRootsTask(p)); | |
4186 } | |
4187 q->enqueue(new ThreadRootsTask(VMThread::vm_thread())); | |
4188 } | |
4189 | |
4190 // Used by Parallel Old | |
4191 void Threads::create_thread_roots_marking_tasks(GCTaskQueue* q) { | |
4192 ALL_JAVA_THREADS(p) { | |
4193 q->enqueue(new ThreadRootsMarkingTask(p)); | |
4194 } | |
4195 q->enqueue(new ThreadRootsMarkingTask(VMThread::vm_thread())); | |
4196 } | |
8001
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8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
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changeset
|
4197 #endif // INCLUDE_ALL_GCS |
0 | 4198 |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4199 void Threads::nmethods_do(CodeBlobClosure* cf) { |
0 | 4200 ALL_JAVA_THREADS(p) { |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4201 p->nmethods_do(cf); |
0 | 4202 } |
989
148e5441d916
6863023: need non-perm oops in code cache for JSR 292
jrose
parents:
844
diff
changeset
|
4203 VMThread::vm_thread()->nmethods_do(cf); |
0 | 4204 } |
4205 | |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6198
diff
changeset
|
4206 void Threads::metadata_do(void f(Metadata*)) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4207 ALL_JAVA_THREADS(p) { |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4208 p->metadata_do(f); |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4209 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4210 } |
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
parents:
6198
diff
changeset
|
4211 |
0 | 4212 void Threads::gc_epilogue() { |
4213 ALL_JAVA_THREADS(p) { | |
4214 p->gc_epilogue(); | |
4215 } | |
4216 } | |
4217 | |
4218 void Threads::gc_prologue() { | |
4219 ALL_JAVA_THREADS(p) { | |
4220 p->gc_prologue(); | |
4221 } | |
4222 } | |
4223 | |
4224 void Threads::deoptimized_wrt_marked_nmethods() { | |
4225 ALL_JAVA_THREADS(p) { | |
4226 p->deoptimized_wrt_marked_nmethods(); | |
4227 } | |
4228 } | |
4229 | |
4230 | |
4231 // Get count Java threads that are waiting to enter the specified monitor. | |
4232 GrowableArray<JavaThread*>* Threads::get_pending_threads(int count, | |
4233 address monitor, bool doLock) { | |
4234 assert(doLock || SafepointSynchronize::is_at_safepoint(), | |
4235 "must grab Threads_lock or be at safepoint"); | |
4236 GrowableArray<JavaThread*>* result = new GrowableArray<JavaThread*>(count); | |
4237 | |
4238 int i = 0; | |
4239 { | |
4240 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4241 ALL_JAVA_THREADS(p) { | |
4242 if (p->is_Compiler_thread()) continue; | |
4243 | |
4244 address pending = (address)p->current_pending_monitor(); | |
4245 if (pending == monitor) { // found a match | |
4246 if (i < count) result->append(p); // save the first count matches | |
4247 i++; | |
4248 } | |
4249 } | |
4250 } | |
4251 return result; | |
4252 } | |
4253 | |
4254 | |
4255 JavaThread *Threads::owning_thread_from_monitor_owner(address owner, bool doLock) { | |
4256 assert(doLock || | |
4257 Threads_lock->owned_by_self() || | |
4258 SafepointSynchronize::is_at_safepoint(), | |
4259 "must grab Threads_lock or be at safepoint"); | |
4260 | |
4261 // NULL owner means not locked so we can skip the search | |
4262 if (owner == NULL) return NULL; | |
4263 | |
4264 { | |
4265 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4266 ALL_JAVA_THREADS(p) { | |
4267 // first, see if owner is the address of a Java thread | |
4268 if (owner == (address)p) return p; | |
4269 } | |
4270 } | |
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4271 // Cannot assert on lack of success here since this function may be |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4272 // used by code that is trying to report useful problem information |
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4273 // like deadlock detection. |
0 | 4274 if (UseHeavyMonitors) return NULL; |
4275 | |
4276 // | |
4277 // If we didn't find a matching Java thread and we didn't force use of | |
4278 // heavyweight monitors, then the owner is the stack address of the | |
4279 // Lock Word in the owning Java thread's stack. | |
4280 // | |
4281 JavaThread* the_owner = NULL; | |
4282 { | |
4283 MutexLockerEx ml(doLock ? Threads_lock : NULL); | |
4284 ALL_JAVA_THREADS(q) { | |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4285 if (q->is_lock_owned(owner)) { |
0 | 4286 the_owner = q; |
702
b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
xlu
parents:
669
diff
changeset
|
4287 break; |
0 | 4288 } |
4289 } | |
4290 } | |
8673
5ee250974db9
8007476: assert(the_owner != NULL) failed: Did not find owning Java thread for lock word address
dcubed
parents:
8041
diff
changeset
|
4291 // cannot assert on lack of success here; see above comment |
0 | 4292 return the_owner; |
4293 } | |
4294 | |
4295 // Threads::print_on() is called at safepoint by VM_PrintThreads operation. | |
4296 void Threads::print_on(outputStream* st, bool print_stacks, bool internal_format, bool print_concurrent_locks) { | |
4297 char buf[32]; | |
4298 st->print_cr(os::local_time_string(buf, sizeof(buf))); | |
4299 | |
4300 st->print_cr("Full thread dump %s (%s %s):", | |
4301 Abstract_VM_Version::vm_name(), | |
4302 Abstract_VM_Version::vm_release(), | |
4303 Abstract_VM_Version::vm_info_string() | |
4304 ); | |
4305 st->cr(); | |
4306 | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4307 #if INCLUDE_ALL_GCS |
0 | 4308 // Dump concurrent locks |
4309 ConcurrentLocksDump concurrent_locks; | |
4310 if (print_concurrent_locks) { | |
4311 concurrent_locks.dump_at_safepoint(); | |
4312 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4313 #endif // INCLUDE_ALL_GCS |
0 | 4314 |
4315 ALL_JAVA_THREADS(p) { | |
4316 ResourceMark rm; | |
4317 p->print_on(st); | |
4318 if (print_stacks) { | |
4319 if (internal_format) { | |
4320 p->trace_stack(); | |
4321 } else { | |
4322 p->print_stack_on(st); | |
4323 } | |
4324 } | |
4325 st->cr(); | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4326 #if INCLUDE_ALL_GCS |
0 | 4327 if (print_concurrent_locks) { |
4328 concurrent_locks.print_locks_on(p, st); | |
4329 } | |
8001
db9981fd3124
8005915: Unify SERIALGC and INCLUDE_ALTERNATE_GCS
jprovino
parents:
7615
diff
changeset
|
4330 #endif // INCLUDE_ALL_GCS |
0 | 4331 } |
4332 | |
4333 VMThread::vm_thread()->print_on(st); | |
4334 st->cr(); | |
4335 Universe::heap()->print_gc_threads_on(st); | |
4336 WatcherThread* wt = WatcherThread::watcher_thread(); | |
6766 | 4337 if (wt != NULL) { |
4338 wt->print_on(st); | |
4339 st->cr(); | |
4340 } | |
0 | 4341 CompileBroker::print_compiler_threads_on(st); |
4342 st->flush(); | |
4343 } | |
4344 | |
4345 // Threads::print_on_error() is called by fatal error handler. It's possible | |
4346 // that VM is not at safepoint and/or current thread is inside signal handler. | |
4347 // Don't print stack trace, as the stack may not be walkable. Don't allocate | |
4348 // memory (even in resource area), it might deadlock the error handler. | |
4349 void Threads::print_on_error(outputStream* st, Thread* current, char* buf, int buflen) { | |
4350 bool found_current = false; | |
4351 st->print_cr("Java Threads: ( => current thread )"); | |
4352 ALL_JAVA_THREADS(thread) { | |
4353 bool is_current = (current == thread); | |
4354 found_current = found_current || is_current; | |
4355 | |
4356 st->print("%s", is_current ? "=>" : " "); | |
4357 | |
4358 st->print(PTR_FORMAT, thread); | |
4359 st->print(" "); | |
4360 thread->print_on_error(st, buf, buflen); | |
4361 st->cr(); | |
4362 } | |
4363 st->cr(); | |
4364 | |
4365 st->print_cr("Other Threads:"); | |
4366 if (VMThread::vm_thread()) { | |
4367 bool is_current = (current == VMThread::vm_thread()); | |
4368 found_current = found_current || is_current; | |
4369 st->print("%s", current == VMThread::vm_thread() ? "=>" : " "); | |
4370 | |
4371 st->print(PTR_FORMAT, VMThread::vm_thread()); | |
4372 st->print(" "); | |
4373 VMThread::vm_thread()->print_on_error(st, buf, buflen); | |
4374 st->cr(); | |
4375 } | |
4376 WatcherThread* wt = WatcherThread::watcher_thread(); | |
4377 if (wt != NULL) { | |
4378 bool is_current = (current == wt); | |
4379 found_current = found_current || is_current; | |
4380 st->print("%s", is_current ? "=>" : " "); | |
4381 | |
4382 st->print(PTR_FORMAT, wt); | |
4383 st->print(" "); | |
4384 wt->print_on_error(st, buf, buflen); | |
4385 st->cr(); | |
4386 } | |
4387 if (!found_current) { | |
4388 st->cr(); | |
4389 st->print("=>" PTR_FORMAT " (exited) ", current); | |
4390 current->print_on_error(st, buf, buflen); | |
4391 st->cr(); | |
4392 } | |
4393 } | |
4394 | |
1878 | 4395 // Internal SpinLock and Mutex |
4396 // Based on ParkEvent | |
4397 | |
4398 // Ad-hoc mutual exclusion primitives: SpinLock and Mux | |
0 | 4399 // |
1878 | 4400 // We employ SpinLocks _only for low-contention, fixed-length |
4401 // short-duration critical sections where we're concerned | |
4402 // about native mutex_t or HotSpot Mutex:: latency. | |
4403 // The mux construct provides a spin-then-block mutual exclusion | |
4404 // mechanism. | |
4405 // | |
4406 // Testing has shown that contention on the ListLock guarding gFreeList | |
4407 // is common. If we implement ListLock as a simple SpinLock it's common | |
4408 // for the JVM to devolve to yielding with little progress. This is true | |
4409 // despite the fact that the critical sections protected by ListLock are | |
4410 // extremely short. | |
0 | 4411 // |
1878 | 4412 // TODO-FIXME: ListLock should be of type SpinLock. |
4413 // We should make this a 1st-class type, integrated into the lock | |
4414 // hierarchy as leaf-locks. Critically, the SpinLock structure | |
4415 // should have sufficient padding to avoid false-sharing and excessive | |
4416 // cache-coherency traffic. | |
4417 | |
4418 | |
4419 typedef volatile int SpinLockT ; | |
4420 | |
4421 void Thread::SpinAcquire (volatile int * adr, const char * LockName) { | |
4422 if (Atomic::cmpxchg (1, adr, 0) == 0) { | |
4423 return ; // normal fast-path return | |
4424 } | |
4425 | |
4426 // Slow-path : We've encountered contention -- Spin/Yield/Block strategy. | |
4427 TEVENT (SpinAcquire - ctx) ; | |
4428 int ctr = 0 ; | |
4429 int Yields = 0 ; | |
0 | 4430 for (;;) { |
1878 | 4431 while (*adr != 0) { |
4432 ++ctr ; | |
4433 if ((ctr & 0xFFF) == 0 || !os::is_MP()) { | |
4434 if (Yields > 5) { | |
4435 // Consider using a simple NakedSleep() instead. | |
4436 // Then SpinAcquire could be called by non-JVM threads | |
4437 Thread::current()->_ParkEvent->park(1) ; | |
4438 } else { | |
4439 os::NakedYield() ; | |
4440 ++Yields ; | |
4441 } | |
4442 } else { | |
4443 SpinPause() ; | |
0 | 4444 } |
1878 | 4445 } |
4446 if (Atomic::cmpxchg (1, adr, 0) == 0) return ; | |
0 | 4447 } |
4448 } | |
4449 | |
1878 | 4450 void Thread::SpinRelease (volatile int * adr) { |
4451 assert (*adr != 0, "invariant") ; | |
4452 OrderAccess::fence() ; // guarantee at least release consistency. | |
4453 // Roach-motel semantics. | |
4454 // It's safe if subsequent LDs and STs float "up" into the critical section, | |
4455 // but prior LDs and STs within the critical section can't be allowed | |
4456 // to reorder or float past the ST that releases the lock. | |
4457 *adr = 0 ; | |
0 | 4458 } |
4459 | |
1878 | 4460 // muxAcquire and muxRelease: |
4461 // | |
4462 // * muxAcquire and muxRelease support a single-word lock-word construct. | |
4463 // The LSB of the word is set IFF the lock is held. | |
4464 // The remainder of the word points to the head of a singly-linked list | |
4465 // of threads blocked on the lock. | |
4466 // | |
4467 // * The current implementation of muxAcquire-muxRelease uses its own | |
4468 // dedicated Thread._MuxEvent instance. If we're interested in | |
4469 // minimizing the peak number of extant ParkEvent instances then | |
4470 // we could eliminate _MuxEvent and "borrow" _ParkEvent as long | |
4471 // as certain invariants were satisfied. Specifically, care would need | |
4472 // to be taken with regards to consuming unpark() "permits". | |
4473 // A safe rule of thumb is that a thread would never call muxAcquire() | |
4474 // if it's enqueued (cxq, EntryList, WaitList, etc) and will subsequently | |
4475 // park(). Otherwise the _ParkEvent park() operation in muxAcquire() could | |
4476 // consume an unpark() permit intended for monitorenter, for instance. | |
4477 // One way around this would be to widen the restricted-range semaphore | |
4478 // implemented in park(). Another alternative would be to provide | |
4479 // multiple instances of the PlatformEvent() for each thread. One | |
4480 // instance would be dedicated to muxAcquire-muxRelease, for instance. | |
4481 // | |
4482 // * Usage: | |
4483 // -- Only as leaf locks | |
4484 // -- for short-term locking only as muxAcquire does not perform | |
4485 // thread state transitions. | |
4486 // | |
4487 // Alternatives: | |
4488 // * We could implement muxAcquire and muxRelease with MCS or CLH locks | |
4489 // but with parking or spin-then-park instead of pure spinning. | |
4490 // * Use Taura-Oyama-Yonenzawa locks. | |
4491 // * It's possible to construct a 1-0 lock if we encode the lockword as | |
4492 // (List,LockByte). Acquire will CAS the full lockword while Release | |
4493 // will STB 0 into the LockByte. The 1-0 scheme admits stranding, so | |
4494 // acquiring threads use timers (ParkTimed) to detect and recover from | |
4495 // the stranding window. Thread/Node structures must be aligned on 256-byte | |
4496 // boundaries by using placement-new. | |
4497 // * Augment MCS with advisory back-link fields maintained with CAS(). | |
4498 // Pictorially: LockWord -> T1 <-> T2 <-> T3 <-> ... <-> Tn <-> Owner. | |
4499 // The validity of the backlinks must be ratified before we trust the value. | |
4500 // If the backlinks are invalid the exiting thread must back-track through the | |
4501 // the forward links, which are always trustworthy. | |
4502 // * Add a successor indication. The LockWord is currently encoded as | |
4503 // (List, LOCKBIT:1). We could also add a SUCCBIT or an explicit _succ variable | |
4504 // to provide the usual futile-wakeup optimization. | |
4505 // See RTStt for details. | |
4506 // * Consider schedctl.sc_nopreempt to cover the critical section. | |
4507 // | |
4508 | |
4509 | |
4510 typedef volatile intptr_t MutexT ; // Mux Lock-word | |
4511 enum MuxBits { LOCKBIT = 1 } ; | |
4512 | |
4513 void Thread::muxAcquire (volatile intptr_t * Lock, const char * LockName) { | |
4514 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4515 if (w == 0) return ; | |
4516 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4517 return ; | |
4518 } | |
4519 | |
4520 TEVENT (muxAcquire - Contention) ; | |
4521 ParkEvent * const Self = Thread::current()->_MuxEvent ; | |
4522 assert ((intptr_t(Self) & LOCKBIT) == 0, "invariant") ; | |
0 | 4523 for (;;) { |
1878 | 4524 int its = (os::is_MP() ? 100 : 0) + 1 ; |
4525 | |
4526 // Optional spin phase: spin-then-park strategy | |
4527 while (--its >= 0) { | |
4528 w = *Lock ; | |
4529 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4530 return ; | |
4531 } | |
4532 } | |
4533 | |
4534 Self->reset() ; | |
4535 Self->OnList = intptr_t(Lock) ; | |
4536 // The following fence() isn't _strictly necessary as the subsequent | |
4537 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4538 OrderAccess::fence(); | |
4539 for (;;) { | |
4540 w = *Lock ; | |
4541 if ((w & LOCKBIT) == 0) { | |
4542 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4543 Self->OnList = 0 ; // hygiene - allows stronger asserts | |
4544 return ; | |
4545 } | |
4546 continue ; // Interference -- *Lock changed -- Just retry | |
0 | 4547 } |
1878 | 4548 assert (w & LOCKBIT, "invariant") ; |
4549 Self->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4550 if (Atomic::cmpxchg_ptr (intptr_t(Self)|LOCKBIT, Lock, w) == w) break ; | |
4551 } | |
4552 | |
4553 while (Self->OnList != 0) { | |
4554 Self->park() ; | |
4555 } | |
0 | 4556 } |
4557 } | |
4558 | |
1878 | 4559 void Thread::muxAcquireW (volatile intptr_t * Lock, ParkEvent * ev) { |
4560 intptr_t w = Atomic::cmpxchg_ptr (LOCKBIT, Lock, 0) ; | |
4561 if (w == 0) return ; | |
4562 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4563 return ; | |
4564 } | |
4565 | |
4566 TEVENT (muxAcquire - Contention) ; | |
4567 ParkEvent * ReleaseAfter = NULL ; | |
4568 if (ev == NULL) { | |
4569 ev = ReleaseAfter = ParkEvent::Allocate (NULL) ; | |
4570 } | |
4571 assert ((intptr_t(ev) & LOCKBIT) == 0, "invariant") ; | |
4572 for (;;) { | |
4573 guarantee (ev->OnList == 0, "invariant") ; | |
4574 int its = (os::is_MP() ? 100 : 0) + 1 ; | |
4575 | |
4576 // Optional spin phase: spin-then-park strategy | |
4577 while (--its >= 0) { | |
4578 w = *Lock ; | |
4579 if ((w & LOCKBIT) == 0 && Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4580 if (ReleaseAfter != NULL) { | |
4581 ParkEvent::Release (ReleaseAfter) ; | |
4582 } | |
4583 return ; | |
4584 } | |
4585 } | |
4586 | |
4587 ev->reset() ; | |
4588 ev->OnList = intptr_t(Lock) ; | |
4589 // The following fence() isn't _strictly necessary as the subsequent | |
4590 // CAS() both serializes execution and ratifies the fetched *Lock value. | |
4591 OrderAccess::fence(); | |
4592 for (;;) { | |
4593 w = *Lock ; | |
4594 if ((w & LOCKBIT) == 0) { | |
4595 if (Atomic::cmpxchg_ptr (w|LOCKBIT, Lock, w) == w) { | |
4596 ev->OnList = 0 ; | |
4597 // We call ::Release while holding the outer lock, thus | |
4598 // artificially lengthening the critical section. | |
4599 // Consider deferring the ::Release() until the subsequent unlock(), | |
4600 // after we've dropped the outer lock. | |
4601 if (ReleaseAfter != NULL) { | |
4602 ParkEvent::Release (ReleaseAfter) ; | |
4603 } | |
4604 return ; | |
4605 } | |
4606 continue ; // Interference -- *Lock changed -- Just retry | |
4607 } | |
4608 assert (w & LOCKBIT, "invariant") ; | |
4609 ev->ListNext = (ParkEvent *) (w & ~LOCKBIT ); | |
4610 if (Atomic::cmpxchg_ptr (intptr_t(ev)|LOCKBIT, Lock, w) == w) break ; | |
4611 } | |
4612 | |
4613 while (ev->OnList != 0) { | |
4614 ev->park() ; | |
4615 } | |
4616 } | |
4617 } | |
4618 | |
4619 // Release() must extract a successor from the list and then wake that thread. | |
4620 // It can "pop" the front of the list or use a detach-modify-reattach (DMR) scheme | |
4621 // similar to that used by ParkEvent::Allocate() and ::Release(). DMR-based | |
4622 // Release() would : | |
4623 // (A) CAS() or swap() null to *Lock, releasing the lock and detaching the list. | |
4624 // (B) Extract a successor from the private list "in-hand" | |
4625 // (C) attempt to CAS() the residual back into *Lock over null. | |
4626 // If there were any newly arrived threads and the CAS() would fail. | |
4627 // In that case Release() would detach the RATs, re-merge the list in-hand | |
4628 // with the RATs and repeat as needed. Alternately, Release() might | |
4629 // detach and extract a successor, but then pass the residual list to the wakee. | |
4630 // The wakee would be responsible for reattaching and remerging before it | |
4631 // competed for the lock. | |
4632 // | |
4633 // Both "pop" and DMR are immune from ABA corruption -- there can be | |
4634 // multiple concurrent pushers, but only one popper or detacher. | |
4635 // This implementation pops from the head of the list. This is unfair, | |
4636 // but tends to provide excellent throughput as hot threads remain hot. | |
4637 // (We wake recently run threads first). | |
4638 | |
4639 void Thread::muxRelease (volatile intptr_t * Lock) { | |
4640 for (;;) { | |
4641 const intptr_t w = Atomic::cmpxchg_ptr (0, Lock, LOCKBIT) ; | |
4642 assert (w & LOCKBIT, "invariant") ; | |
4643 if (w == LOCKBIT) return ; | |
4644 ParkEvent * List = (ParkEvent *) (w & ~LOCKBIT) ; | |
4645 assert (List != NULL, "invariant") ; | |
4646 assert (List->OnList == intptr_t(Lock), "invariant") ; | |
4647 ParkEvent * nxt = List->ListNext ; | |
4648 | |
4649 // The following CAS() releases the lock and pops the head element. | |
4650 if (Atomic::cmpxchg_ptr (intptr_t(nxt), Lock, w) != w) { | |
4651 continue ; | |
4652 } | |
4653 List->OnList = 0 ; | |
4654 OrderAccess::fence() ; | |
4655 List->unpark () ; | |
4656 return ; | |
4657 } | |
4658 } | |
4659 | |
4660 | |
0 | 4661 void Threads::verify() { |
4662 ALL_JAVA_THREADS(p) { | |
4663 p->verify(); | |
4664 } | |
4665 VMThread* thread = VMThread::vm_thread(); | |
4666 if (thread != NULL) thread->verify(); | |
4667 } |